{"id":30426,"date":"2025-09-12T16:57:36","date_gmt":"2025-09-12T16:57:36","guid":{"rendered":"https:\/\/www.dotcom-monitor.com\/blog\/website-monitoring-errors-dns-tcp-tls-http\/"},"modified":"2026-05-22T15:26:02","modified_gmt":"2026-05-22T15:26:02","slug":"website-monitoring-errors-dns-tcp-tls-http","status":"publish","type":"post","link":"https:\/\/www.dotcom-monitor.com\/blog\/ja\/website-monitoring-errors-dns-tcp-tls-http\/","title":{"rendered":"\u30a8\u30e9\u30fc\u7a2e\u985e\u5225\u306e\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u76e3\u8996\uff1aDNS\u3001TCP\u3001TLS\u3001HTTP"},"content":{"rendered":"<p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignright wp-image-30430\" src=\"https:\/\/www.dotcom-monitor.com\/blog\/wp-content\/uploads\/sites\/3\/2025\/09\/dcm-website-monitoring-errors.webp\" alt=\"Website Monitoring by Error Type\" width=\"480\" height=\"320\" srcset=\"https:\/\/www.dotcom-monitor.com\/blog\/wp-content\/uploads\/sites\/3\/2025\/09\/dcm-website-monitoring-errors.webp 1280w, https:\/\/www.dotcom-monitor.com\/blog\/wp-content\/uploads\/sites\/3\/2025\/09\/dcm-website-monitoring-errors-300x200.webp 300w, https:\/\/www.dotcom-monitor.com\/blog\/wp-content\/uploads\/sites\/3\/2025\/09\/dcm-website-monitoring-errors-1024x682.webp 1024w, https:\/\/www.dotcom-monitor.com\/blog\/wp-content\/uploads\/sites\/3\/2025\/09\/dcm-website-monitoring-errors-768x512.webp 768w\" sizes=\"(max-width: 480px) 100vw, 480px\" \/><\/p>\n<p>\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u304c\u30c0\u30a6\u30f3\u3059\u308b\u3068\u3001\u591a\u304f\u306e\u5834\u5408\u30d6\u30e9\u30c3\u30af\u30dc\u30c3\u30af\u30b9\u306e\u4e2d\u306e\u8b0e\u306e\u3088\u3046\u306b\u611f\u3058\u3089\u308c\u307e\u3059\u3002\u8a2a\u554f\u8005\u306f\u304f\u308b\u304f\u308b\u56de\u308b\u30ed\u30fc\u30c7\u30a3\u30f3\u30b0\u3001\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9\u3001\u307e\u305f\u306f\u767d\u3044\u753b\u9762\u3092\u898b\u308b\u3060\u3051\u3067\u3059\u304c\u3001IT \u30c1\u30fc\u30e0\u3084 DevOps \u30a8\u30f3\u30b8\u30cb\u30a2\u306b\u3068\u3063\u3066\u6700\u521d\u306e\u554f\u3044\u306f\u5e38\u306b\u540c\u3058\u3067\u3059\uff1a\u4f55\u304c\u58ca\u308c\u305f\u306e\u304b\uff1f<\/p>\n<p>\u5b9f\u969b\u306b\u306f\u3001\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u304c\u300c\u30c0\u30a6\u30f3\u3059\u308b\u300d\u65b9\u6cd5\u306f\u4e00\u3064\u3060\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u3059\u3079\u3066\u306e\u30d6\u30e9\u30a6\u30b6\u30ea\u30af\u30a8\u30b9\u30c8\u306f\u8907\u6570\u306e\u6bb5\u968e\u3092\u7d4c\u307e\u3059\u2014\u2014DNS \u89e3\u6c7a\u3001TCP \u63a5\u7d9a\u3001TLS\/SSL \u30cd\u30b4\u30b7\u30a8\u30fc\u30b7\u30e7\u30f3\u3001HTTP \u5fdc\u7b54\u2014\u2014\u305d\u3057\u3066\u5404\u30ec\u30a4\u30e4\u30fc\u306f\u6f5c\u5728\u7684\u306a\u6545\u969c\u70b9\u3092\u6301\u3061\u307e\u3059\u3002\u30c1\u30a7\u30fc\u30f3\u306e\u4e00\u90e8\u304c\u6a5f\u80fd\u3057\u306a\u304f\u306a\u308b\u3068\u3001\u30e6\u30fc\u30b6\u30fc\u4f53\u9a13\u5168\u4f53\u304c\u963b\u5bb3\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u3060\u304b\u3089\u3053\u305d\u3001\u73fe\u4ee3\u306e\u30a6\u30a7\u30d6\u76e3\u8996\u306f\u5358\u7d14\u306a\u7a3c\u50cd\u78ba\u8a8d\u3092\u8d85\u3048\u3066\u3044\u307e\u3059\u3002\u30b9\u30de\u30fc\u30c8\u306a\u76e3\u8996\u306f\u5358\u306b\u30b5\u30a4\u30c8\u304c\u300c\u30c0\u30a6\u30f3\u300d\u3067\u3042\u308b\u3068\u77e5\u3089\u305b\u308b\u3060\u3051\u3067\u306a\u304f\u3001\u554f\u984c\u304c\u767a\u751f\u3057\u305f\u30ec\u30a4\u30e4\u30fc\u3092\u7279\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li aria-level=\"1\">DNS \u30a8\u30e9\u30fc\u306f\u30c9\u30e1\u30a4\u30f3\u3084\u30ea\u30be\u30eb\u30d0\u306e\u554f\u984c\u3092\u793a\u3057\u307e\u3059\u3002<\/li>\n<li aria-level=\"1\">TCP \u969c\u5bb3\u306f\u63a5\u7d9a\u3084\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u306e\u554f\u984c\u3092\u793a\u5506\u3057\u307e\u3059\u3002<\/li>\n<li aria-level=\"1\">TLS\/SSL \u30a8\u30e9\u30fc\u306f\u8a3c\u660e\u66f8\u3084\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u95a2\u9023\u306e\u554f\u984c\u3092\u793a\u3057\u307e\u3059\u3002<\/li>\n<li aria-level=\"1\">HTTP \u306e 5xx \u5fdc\u7b54\u306f\u30b5\u30fc\u30d0\u30fc\u5074\u306e\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30a8\u30e9\u30fc\u3092\u660e\u3089\u304b\u306b\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<p>\u3069\u306e\u30ec\u30a4\u30e4\u30fc\u304c\u5931\u6557\u3057\u305f\u304b\u3092\u8b58\u5225\u3059\u308b\u3053\u3068\u3067\u3001\u30c1\u30fc\u30e0\u306f\u3088\u308a\u901f\u304f\u5bfe\u5fdc\u3057\u3001\u5e73\u5747\u5fa9\u65e7\u6642\u9593\uff08MTTR\uff09\u3092\u77ed\u7e2e\u3057\u3001\u7121\u99c4\u306a\u30a8\u30b9\u30ab\u30ec\u30fc\u30b7\u30e7\u30f3\u3084\u63a8\u6e2c\u3092\u907f\u3051\u3066\u6b63\u3057\u3044\u554f\u984c\u3092\u89e3\u6c7a\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2 id='dns-\u30a8\u30e9\u30fc-\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u969c\u5bb3\u306e\u6700\u521d\u306e\u30dd\u30a4\u30f3\u30c8'  id=\"boomdevs_1\">DNS \u30a8\u30e9\u30fc\uff1a\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u969c\u5bb3\u306e\u6700\u521d\u306e\u30dd\u30a4\u30f3\u30c8<\/h2>\n<p>\u3059\u3079\u3066\u306e\u30a6\u30a7\u30d6\u30ea\u30af\u30a8\u30b9\u30c8\u306f DNS\uff08<b>\u30c9\u30e1\u30a4\u30f3\u30cd\u30fc\u30e0\u30b7\u30b9\u30c6\u30e0<\/b>\uff09\u306e\u89e3\u6c7a\u304b\u3089\u59cb\u307e\u308a\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30a6\u30a7\u30d6\u914d\u4fe1\u30c1\u30a7\u30fc\u30f3\u306e\u4e2d\u3067\u3082\u6700\u3082\u91cd\u8981\u306a\u30ec\u30a4\u30e4\u30fc\u306e\u4e00\u3064\u306b\u306a\u308a\u307e\u3059\u3002\u30e6\u30fc\u30b6\u30fc\u304c\u30d6\u30e9\u30a6\u30b6\u306b\u30c9\u30e1\u30a4\u30f3\u3092\u5165\u529b\u3059\u308b\u3068\u3001\u6700\u521d\u306e\u30a2\u30af\u30b7\u30e7\u30f3\u306f DNS \u30af\u30a8\u30ea\u3067\u3001\u30c9\u30e1\u30a4\u30f3\u540d\u3092\u30d6\u30e9\u30a6\u30b6\u304c\u63a5\u7d9a\u3059\u3079\u304d IP \u30a2\u30c9\u30ec\u30b9\u306b\u5909\u63db\u3057\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u30b9\u30c6\u30c3\u30d7\u304c\u5931\u6557\u3059\u308b\u3068\u3001\u4ed6\u306e\u51e6\u7406\u306f\u4f55\u3082\u9032\u307f\u307e\u305b\u3093\u3002\u30d6\u30e9\u30a6\u30b6\u306f TCP \u63a5\u7d9a\u3092\u78ba\u7acb\u305b\u305a\u3001TLS\/SSL \u8a3c\u660e\u66f8\u3092\u691c\u8a3c\u305b\u305a\u3001HTTP \u5fdc\u7b54\u3082\u53d7\u3051\u53d6\u308a\u307e\u305b\u3093\u3002\u8a00\u3044\u63db\u3048\u308c\u3070\u3001DNS \u304c\u57fa\u790e\u3067\u3042\u308a\u3001\u305d\u308c\u304c\u58ca\u308c\u308b\u3068\u30b5\u30a4\u30c8\u5168\u4f53\u304c\u771f\u3063\u6697\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u305d\u306e\u305f\u3081\u3001<a href=\"https:\/\/www.dotcom-monitor.com\/ja\/%e3%83%a2%e3%83%8b%e3%82%bf%e3%83%aa%e3%83%b3%e3%82%b0%e8%a3%bd%e5%93%81\/dns%e7%9b%a3%e8%a6%96%e3%83%84%e3%83%bc%e3%83%ab-%e3%83%89%e3%83%83%e3%83%88%e3%82%b3%e3%83%a0%e3%83%a2%e3%83%8b%e3%82%bf%e3%83%bc\/\">DNS \u76e3\u8996<\/a>\u306f\u6f5c\u5728\u7684\u306a\u30b5\u30a4\u30c8\u505c\u6b62\u306e\u6700\u521d\u304b\u3064\u6700\u91cd\u8981\u306e\u6307\u6a19\u3067\u3042\u308b\u3053\u3068\u304c\u591a\u3044\u306e\u3067\u3059\u3002\u65e9\u671f\u306b DNS \u306e\u554f\u984c\u3092\u691c\u77e5\u3059\u308b\u3053\u3068\u3067\u3001\u30c1\u30fc\u30e0\u306f\u5e83\u7bc4\u306a\u30c0\u30a6\u30f3\u30bf\u30a4\u30e0\u3092\u9632\u304e\u3001\u53ce\u76ca\u640d\u5931\u3092\u56de\u907f\u3057\u3001\u554f\u984c\u304c\u62e1\u5927\u3059\u308b\u524d\u306b\u30e6\u30fc\u30b6\u30fc\u306e\u4fe1\u983c\u3092\u7dad\u6301\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2 id='\u3088\u304f\u3042\u308b-dns-\u30a8\u30e9\u30fc\u3068\u305d\u306e\u610f\u5473'  id=\"boomdevs_2\">\u3088\u304f\u3042\u308b DNS \u30a8\u30e9\u30fc\u3068\u305d\u306e\u610f\u5473<\/h2>\n<p>DNS \u306f\u3059\u3079\u3066\u306e\u30a6\u30a7\u30d6\u30ea\u30af\u30a8\u30b9\u30c8\u306e\u6700\u521d\u306e\u30b9\u30c6\u30c3\u30d7\u3067\u3042\u308b\u305f\u3081\u3001\u3053\u3053\u3067\u306e\u5c0f\u3055\u306a\u554f\u984c\u3067\u3082\u5927\u304d\u306a\u969c\u5bb3\u306b\u3064\u306a\u304c\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u4e00\u822c\u7684\u306a <b>DNS \u30a8\u30e9\u30fc\u306e\u7a2e\u985e<\/b> \u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u3067\u3001\u30c1\u30fc\u30e0\u306f\u6839\u672c\u539f\u56e0\u3092\u3088\u308a\u65e9\u304f\u7279\u5b9a\u3057\u3001\u30c0\u30a6\u30f3\u30bf\u30a4\u30e0\u304c\u30e6\u30fc\u30b6\u30fc\u306b\u5f71\u97ff\u3092\u53ca\u307c\u3059\u524d\u306b\u5bfe\u5fdc\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u306f\u3001\u6700\u3082\u983b\u7e41\u306b\u906d\u9047\u3059\u308b DNS \u969c\u5bb3\u3068\u305d\u306e\u793a\u3059\u5185\u5bb9\u3067\u3059\uff1a<\/p>\n<h3 id='1-nxdomain-\u5b58\u5728\u3057\u306a\u3044\u30c9\u30e1\u30a4\u30f3'  id=\"boomdevs_3\">1. NXDOMAIN\uff08\u5b58\u5728\u3057\u306a\u3044\u30c9\u30e1\u30a4\u30f3\uff09<\/h3>\n<p>\u3053\u306e\u30a8\u30e9\u30fc\u306f\u30c9\u30e1\u30a4\u30f3\u540d\u304c\u5b58\u5728\u3057\u306a\u3044\u304b\u89e3\u6c7a\u3067\u304d\u306a\u3044\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002<br \/>\n\u4e3b\u306a\u539f\u56e0\u306b\u306f\u4ee5\u4e0b\u304c\u3088\u304f\u3042\u308a\u307e\u3059\uff1a<\/p>\n<ul>\n<li aria-level=\"1\">\u30c9\u30e1\u30a4\u30f3\u306e\u671f\u9650\u5207\u308c\u307e\u305f\u306f\u672a\u767b\u9332<\/li>\n<li aria-level=\"1\">DNS \u30be\u30fc\u30f3\u30d5\u30a1\u30a4\u30eb\u306e\u8a2d\u5b9a\u30df\u30b9<\/li>\n<li aria-level=\"1\">DNS \u30ec\u30b3\u30fc\u30c9\u3084 CNAME \u30a8\u30f3\u30c8\u30ea\u306e\u30bf\u30a4\u30d7\u30df\u30b9<\/li>\n<\/ul>\n<p>\u30c9\u30e1\u30a4\u30f3\u306e\u671f\u9650\u5207\u308c\u306f\u30b5\u30a4\u30c8\u3092\u5373\u5ea7\u306b\u30aa\u30d5\u30e9\u30a4\u30f3\u306b\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u3001\u308f\u305a\u304b\u306a\u8a2d\u5b9a\u30df\u30b9\u306f\u7279\u5b9a\u306e\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u3084\u30b5\u30fc\u30d3\u30b9\u3060\u3051\u3092\u58ca\u3059\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u7d99\u7d9a\u7684\u306a <b>DNS \u76e3\u8996<\/b> \u306b\u3088\u308a\u3001\u7279\u306b\u30c9\u30e1\u30a4\u30f3\u306e\u66f4\u65b0\u3084\u8a2d\u5b9a\u5909\u66f4\u5f8c\u306b\u3053\u308c\u3089\u306e\u554f\u984c\u3092\u65e9\u671f\u306b\u691c\u51fa\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3 id='2-servfail-\u30b5\u30fc\u30d0\u30fc\u969c\u5bb3'  id=\"boomdevs_4\">2. SERVFAIL\uff08\u30b5\u30fc\u30d0\u30fc\u969c\u5bb3\uff09<\/h3>\n<p><b>SERVFAIL<\/b> \u306f\u3001\u6a29\u5a01\u3042\u308b DNS \u30b5\u30fc\u30d0\u30fc\u304c\u30af\u30a8\u30ea\u3092\u51e6\u7406\u3067\u304d\u306a\u304b\u3063\u305f\u3053\u3068\u3092\u793a\u3057\u307e\u3059\u3002<br \/>\n\u4e00\u822c\u7684\u306a\u539f\u56e0\u306f\uff1a<\/p>\n<ul>\n<li aria-level=\"1\">\u7834\u640d\u307e\u305f\u306f\u4e0d\u5b8c\u5168\u306a\u30be\u30fc\u30f3\u30d5\u30a1\u30a4\u30eb<\/li>\n<li aria-level=\"1\">\u4e0d\u8db3\u3057\u3066\u3044\u308b\u30b0\u30eb\u30fc\u30ec\u30b3\u30fc\u30c9\uff08glue records\uff09<\/li>\n<li aria-level=\"1\">DNSSEC \u306e\u691c\u8a3c\u30a8\u30e9\u30fc<\/li>\n<\/ul>\n<p>SERVFAIL \u5fdc\u7b54\u306f\u3001\u30b7\u30b9\u30c6\u30e0\u3084\u8a2d\u5b9a\u306e\u66f4\u65b0\u5f8c\u306b\u7a81\u7136\u73fe\u308c\u308b\u3053\u3068\u304c\u591a\u304f\u3001\u4e0d\u5177\u5408\u3042\u308b\u30c7\u30d7\u30ed\u30a4\u306e\u65e9\u671f\u8b66\u544a\u30b5\u30a4\u30f3\u3068\u306a\u308a\u307e\u3059\u3002\u30ea\u30a2\u30eb\u30bf\u30a4\u30e0\u306e <b>DNS \u5065\u5eb7\u30c1\u30a7\u30c3\u30af<\/b> \u306b\u3088\u308a\u3001\u3053\u308c\u3089\u306e\u30b5\u30fc\u30d0\u30fc\u30ec\u30d9\u30eb\u554f\u984c\u304c\u767a\u751f\u3057\u305f\u77ac\u9593\u306b\u30c1\u30fc\u30e0\u306b\u901a\u77e5\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3 id='3-dns-\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8'  id=\"boomdevs_5\">3. DNS \u30bf\u30a4\u30e0\u30a2\u30a6\u30c8<\/h3>\n<p>\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u306f DNS \u30af\u30a8\u30ea\u304c\u671f\u5f85\u3055\u308c\u308b\u6642\u9593\u5185\u306b\u5fdc\u7b54\u3092\u53d7\u3051\u306a\u3044\u3068\u304d\u306b\u767a\u751f\u3057\u307e\u3059\u3002<br \/>\n\u5178\u578b\u7684\u306a\u6839\u672c\u539f\u56e0\u306b\u306f\u4ee5\u4e0b\u304c\u542b\u307e\u308c\u307e\u3059\uff1a<\/p>\n<ul>\n<li aria-level=\"1\">\u904e\u8ca0\u8377\u307e\u305f\u306f\u5fdc\u7b54\u3057\u306a\u3044\u30cd\u30fc\u30e0\u30b5\u30fc\u30d0\u30fc<\/li>\n<li aria-level=\"1\">\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u9045\u5ef6\u307e\u305f\u306f\u63a5\u7d9a\u969c\u5bb3<\/li>\n<li aria-level=\"1\">DDoS \u653b\u6483\u306b\u3088\u308b\u30ea\u30be\u30eb\u30d0\u306e\u5727\u8feb<\/li>\n<\/ul>\n<p>DNS \u30af\u30a8\u30ea\u306f\u30ad\u30e3\u30c3\u30b7\u30e5\u3084\u30b3\u30f3\u30c6\u30f3\u30c4\u914d\u4fe1\u306e\u524d\u306b\u767a\u751f\u3059\u308b\u305f\u3081\u3001\u308f\u305a\u304b\u306a\u9045\u5ef6\u3067\u3082\u30da\u30fc\u30b8\u8aad\u307f\u8fbc\u307f\u6642\u9593\u306e\u5897\u52a0\u3084\u30e6\u30fc\u30b6\u30fc\u4f53\u9a13\u306e\u52a3\u5316\u306b\u3064\u306a\u304c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002Dotcom-Monitor \u306e\u3088\u3046\u306a <b>\u30d7\u30ed\u30a2\u30af\u30c6\u30a3\u30d6\u306a\u30b0\u30ed\u30fc\u30d0\u30eb DNS \u76e3\u8996<\/b> \u306f\u8907\u6570\u306e\u30ed\u30b1\u30fc\u30b7\u30e7\u30f3\u304b\u3089\u30af\u30a8\u30ea\u3092\u30c6\u30b9\u30c8\u3057\u3001\u9867\u5ba2\u304c\u5f71\u97ff\u3092\u611f\u3058\u308b\u524d\u306b\u3053\u308c\u3089\u306e\u5730\u57df\u7684\u307e\u305f\u306f\u30d7\u30ed\u30d0\u30a4\u30c0\u7279\u6709\u306e\u9045\u5ef6\u3092\u691c\u51fa\u3057\u307e\u3059\u3002<\/p>\n<h2 id='dns-\u3092\u52b9\u679c\u7684\u306b\u76e3\u8996\u3059\u308b\u65b9\u6cd5'  id=\"boomdevs_6\">DNS \u3092\u52b9\u679c\u7684\u306b\u76e3\u8996\u3059\u308b\u65b9\u6cd5<\/h2>\n<p><b>DNS \u306e\u5065\u5168\u6027<\/b> \u3092\u76e3\u8996\u3059\u308b\u3068\u306f\u3001\u5358\u306b\u30c9\u30e1\u30a4\u30f3\u304c\u4e00\u5ea6\u89e3\u6790\u3055\u308c\u308b\u304b\u3092\u78ba\u8a8d\u3059\u308b\u4ee5\u4e0a\u306e\u3053\u3068\u3067\u3059\u3002\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u4fe1\u983c\u6027\u3092\u771f\u306b\u7406\u89e3\u3059\u308b\u306b\u306f\u3001\u76e3\u8996\u306f\u5b9f\u969b\u306e\u30e6\u30fc\u30b6\u30fc\u304c\u7570\u306a\u308b\u5834\u6240\u3084\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3067\u3069\u306e\u3088\u3046\u306b\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u3092\u4f53\u9a13\u3059\u308b\u304b\u3092\u518d\u73fe\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u5305\u62ec\u7684\u306a <b>DNS \u76e3\u8996<\/b> \u3092\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\uff1a<\/p>\n<h3 id='\u30b0\u30ed\u30fc\u30d0\u30eb-dns-\u30c1\u30a7\u30c3\u30af\u3092\u5b9f\u884c\u3059\u308b'  id=\"boomdevs_7\">\u30b0\u30ed\u30fc\u30d0\u30eb DNS \u30c1\u30a7\u30c3\u30af\u3092\u5b9f\u884c\u3059\u308b<\/h3>\n<p>DNS \u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306f\u5730\u7406\u7684\u306b\u5909\u52d5\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u30ed\u30fc\u30ab\u30eb\u30aa\u30d5\u30a3\u30b9\u304b\u3089\u5373\u5ea7\u306b\u89e3\u6c7a\u3055\u308c\u308b\u30ec\u30b3\u30fc\u30c9\u304c\u3001anycast \u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u306e\u554f\u984c\u3084\u5730\u57df\u7684\u306a\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u969c\u5bb3\u306e\u305f\u3081\u306b\u5225\u5730\u57df\u3067\u306f\u5931\u6557\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u8907\u6570\u306e\u30b0\u30ed\u30fc\u30d0\u30eb\u62e0\u70b9\u304b\u3089 <b><a href=\"https:\/\/www.dotcom-monitor.com\/ja\/%e9%a1%94%e7%ab%8b%e3%81%a1\/synthetic-monitoring\/\">\u30b7\u30f3\u30bb\u30c6\u30a3\u30c3\u30af\u76e3\u8996<\/a> \u30a8\u30fc\u30b8\u30a7\u30f3\u30c8<\/b> \u3092\u4f7f\u7528\u3057\u3066\u3001\u5b9f\u969b\u306e\u30af\u30a8\u30ea\u3092\u30b7\u30df\u30e5\u30ec\u30fc\u30b7\u30e7\u30f3\u3057\u3001\u30e6\u30fc\u30b6\u30fc\u306b\u5f71\u97ff\u304c\u53ca\u3076\u524d\u306b\u5730\u57df\u7279\u6709\u306e\u554f\u984c\u3092\u691c\u51fa\u3057\u307e\u3059\u3002<\/p>\n<p><b>Dotcom-Monitor<\/b> \u306e\u3088\u3046\u306a\u30c4\u30fc\u30eb\u306f <b>\u30de\u30eb\u30c1\u30ea\u30fc\u30b8\u30e7\u30f3 DNS \u89e3\u6c7a\u30c6\u30b9\u30c8<\/b> \u3092\u5b9f\u884c\u3057\u3001\u9045\u5ef6\u306e\u30b9\u30d1\u30a4\u30af\u3001\u30af\u30a8\u30ea\u306e\u5931\u6557\u3001\u307e\u305f\u306f\u8a18\u9332\u306e\u4e0d\u4e00\u81f4\u3092\u30ea\u30a2\u30eb\u30bf\u30a4\u30e0\u3067\u7279\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<h3 id='ttl-time-to-live-\u6319\u52d5\u3092\u8ffd\u8de1\u3059\u308b'  id=\"boomdevs_8\">TTL\uff08Time-to-Live\uff09\u6319\u52d5\u3092\u8ffd\u8de1\u3059\u308b<\/h3>\n<p>\u3059\u3079\u3066\u306e DNS \u30ec\u30b3\u30fc\u30c9\u306b\u306f <b>TTL \u5024<\/b> \u304c\u542b\u307e\u308c\u3001\u3053\u308c\u306f\u30ea\u30be\u30eb\u30d0\u304c\u518d\u554f\u3044\u5408\u308f\u305b\u3092\u884c\u3046\u524d\u306b\u30ec\u30b3\u30fc\u30c9\u3092\u30ad\u30e3\u30c3\u30b7\u30e5\u3059\u308b\u6642\u9593\u3092\u5b9a\u7fa9\u3057\u307e\u3059\u3002<br \/>\n\u9577\u3081\u306e TTL \u306f\u30a8\u30f3\u30c9\u30e6\u30fc\u30b6\u30fc\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u5411\u4e0a\u3055\u305b\u307e\u3059\u304c\u3001\u8a2d\u5b9a\u5909\u66f4\u3084\u79fb\u884c\u5f8c\u306e\u66f4\u65b0\u304c\u53cd\u6620\u3055\u308c\u308b\u307e\u3067\u306b\u6642\u9593\u304c\u304b\u304b\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<br \/>\n\u76e3\u8996\u30c4\u30fc\u30eb\u306f\u3001\u66f4\u65b0\u3055\u308c\u305f\u5024\u304c\u6b63\u3057\u304f\u4f1d\u642c\u3055\u308c\u3066\u3044\u308b\u304b\u3001\u5730\u57df\u9593\u3067 <b>\u53e4\u3044 DNS \u30ad\u30e3\u30c3\u30b7\u30e5\u30a8\u30f3\u30c8\u30ea<\/b> \u304c\u6b8b\u3063\u3066\u3044\u306a\u3044\u304b\u3092\u691c\u8a3c\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h3 id='\u7570\u5e38\u691c\u51fa\u3068\u30a2\u30e9\u30fc\u30c8\u3092\u8a2d\u5b9a\u3059\u308b'  id=\"boomdevs_9\">\u7570\u5e38\u691c\u51fa\u3068\u30a2\u30e9\u30fc\u30c8\u3092\u8a2d\u5b9a\u3059\u308b<\/h3>\n<p>DNS \u76e3\u8996\u3067\u6700\u3082\u4fa1\u5024\u306e\u3042\u308b\u6d1e\u5bdf\u306f\u30c8\u30ec\u30f3\u30c9\u5206\u6790\u304b\u3089\u5f97\u3089\u308c\u307e\u3059\u3002<\/p>\n<ul>\n<li aria-level=\"1\"><b>NXDOMAIN<\/b> \u3084 <b>SERVFAIL<\/b> \u5fdc\u7b54\u306e\u6025\u5897<\/li>\n<li aria-level=\"1\">DNS \u89e3\u6c7a\u30ec\u30a4\u30c6\u30f3\u30b7\u306e\u4e0a\u6607<\/li>\n<li aria-level=\"1\">\u5fdc\u7b54\u6642\u9593\u306e\u5730\u57df\u7684\u4e0d\u4e00\u81f4<\/li>\n<\/ul>\n<p>\u3053\u308c\u3089\u306f\u3088\u308a\u6df1\u523b\u306a\u554f\u984c\u306e\u521d\u671f\u6307\u6a19\u3067\u3042\u308a\u3001\u3057\u3070\u3057\u3070\u30e6\u30fc\u30b6\u30fc\u306e\u5831\u544a\u3088\u308a\u3082\u6570\u6642\u9593\u524d\u306b\u73fe\u308c\u307e\u3059\u3002\u81ea\u52d5\u5316\u3055\u308c\u305f <b>DNS \u7570\u5e38\u30a2\u30e9\u30fc\u30c8<\/b> \u306b\u3088\u308a\u3001\u30c1\u30fc\u30e0\u306f\u5373\u6642\u306b\u5bfe\u5fdc\u3067\u304d\u3001\u9ad8\u3044\u7a3c\u50cd\u7387\u3068\u8fc5\u901f\u306a\u5fa9\u65e7\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>DNS \u76e3\u8996\u304c\u9069\u5207\u306b\u5b9f\u88c5\u3055\u308c\u3066\u3044\u308b\u3068\u3001\u6839\u672c\u539f\u56e0\u3092\u8b58\u5225\u3059\u308b\u3060\u3051\u3067\u306a\u304f\u3001\u4f55\u304c\u58ca\u308c\u3066\u3044\u306a\u3044\u304b\u3092\u9664\u5916\u3059\u308b\u624b\u52a9\u3051\u306b\u3082\u306a\u308a\u307e\u3059\u3002<\/p>\n<p>\u3082\u3057 DNS \u89e3\u6c7a\u304c\u5931\u6557\u3057\u3066\u3044\u308b\u306a\u3089\u3001<b>TCP\u3001TLS\u3001HTTP<\/b> \u306e\u30c1\u30a7\u30c3\u30af\u306f\u305d\u3082\u305d\u3082\u958b\u59cb\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u3002\u3053\u306e\u660e\u78ba\u3055\u306b\u3088\u308a\u8abf\u67fb\u7bc4\u56f2\u304c\u8fc5\u901f\u306b\u7d5e\u3089\u308c\u3001\u9069\u5207\u306a\u30d9\u30f3\u30c0\u30fc\uff08DNS \u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u3001\u30ec\u30b8\u30b9\u30c8\u30e9\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30d7\u30ed\u30d0\u30a4\u30c0\uff09\u306b\u9023\u7d61\u3057\u3066\u89e3\u6c7a\u3092\u56f3\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2 id='tcp-\u63a5\u7d9a\u969c\u5bb3-\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\u304c\u58ca\u308c\u305f\u3068\u304d'  id=\"boomdevs_10\">TCP \u63a5\u7d9a\u969c\u5bb3\uff1a\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\u304c\u58ca\u308c\u305f\u3068\u304d<\/h2>\n<p><b>DNS \u89e3\u6c7a<\/b> \u304c\u6210\u529f\u3057\u3066 IP \u30a2\u30c9\u30ec\u30b9\u3092\u8fd4\u3057\u305f\u5f8c\u3001\u30ea\u30af\u30a8\u30b9\u30c8\u30c1\u30a7\u30fc\u30f3\u306e\u6b21\u306e\u6bb5\u968e\u306f <b>TCP \u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af<\/b> \u3067\u3059\u3002\u3053\u308c\u306f\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3068\u30b5\u30fc\u30d0\u30fc\u306e\u9593\u3067\u901a\u4fe1\u30c1\u30e3\u30cd\u30eb\u3092\u78ba\u7acb\u3059\u308b\u30c7\u30b8\u30bf\u30eb\u306a\u300c\u63e1\u624b\u300d\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\u306f\u5358\u7d14\u306a\u4e09\u6bb5\u968e\u306e\u30d7\u30ed\u30bb\u30b9\u306b\u5f93\u3044\u307e\u3059\uff1a<\/p>\n<ol>\n<li aria-level=\"1\">\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c <b>SYN<\/b>\uff08\u540c\u671f\uff09\u30d1\u30b1\u30c3\u30c8\u3092\u9001\u4fe1\u3057\u307e\u3059\u3002<\/li>\n<li aria-level=\"1\">\u30b5\u30fc\u30d0\u30fc\u304c <b>SYN-ACK<\/b>\uff08\u540c\u671f\u78ba\u8a8d\uff09\u3067\u5fdc\u7b54\u3057\u307e\u3059\u3002<\/li>\n<li aria-level=\"1\">\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c <b>ACK<\/b> \u3092\u8fd4\u3057\u3001\u63a5\u7d9a\u304c\u5b8c\u4e86\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<p>\u3053\u306e\u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\u304c\u5b8c\u4e86\u3057\u3066\u521d\u3081\u3066\u30d6\u30e9\u30a6\u30b6\u3068\u30a6\u30a7\u30d6\u30b5\u30fc\u30d0\u30fc\u9593\u3067\u30c7\u30fc\u30bf\u306e\u9001\u53d7\u4fe1\u304c\u958b\u59cb\u3055\u308c\u307e\u3059\u3002<\/p>\n<p><b>TCP \u304c\u5931\u6557\u3059\u308b\u3068<\/b>\u3001\u30d6\u30e9\u30a6\u30b6\u306f\u30b5\u30fc\u30d0\u30fc\u306e\u5834\u6240\u3092\u77e5\u3063\u3066\u3044\u3066\u3082\uff08DNS \u306b\u3088\u308a\uff09\u63a5\u7d9a\u3067\u304d\u307e\u305b\u3093\u3002\u7d50\u679c\u306f <b>\u30d6\u30e9\u30c3\u30af\u30db\u30fc\u30eb<\/b> \u306e\u3088\u3046\u306b\u611f\u3058\u3089\u308c\u307e\u3059\uff1a\u30da\u30fc\u30b8\u306f\u7121\u9650\u306b\u505c\u6b62\u3057\u3001\u30bd\u30b1\u30c3\u30c8\u306f\u9589\u3058\u305f\u307e\u307e\u3001\u30e6\u30fc\u30b6\u30fc\u306f\u7d42\u308f\u308a\u306e\u306a\u3044\u30ed\u30fc\u30c7\u30a3\u30f3\u30b0\u30b9\u30d4\u30ca\u30fc\u3092\u898b\u307e\u3059\u3002<\/p>\n<p>\u5373\u6642\u304b\u3064\u660e\u767d\u306a\u3053\u3068\u304c\u591a\u3044 <b>DNS \u969c\u5bb3<\/b> \u3068\u7570\u306a\u308a\u3001<b>TCP \u63a5\u7d9a\u554f\u984c<\/b> \u306f\u3057\u3070\u3057\u3070 <b>\u90e8\u5206\u7684\u306a\u969c\u5bb3<\/b> \u3092\u5f15\u304d\u8d77\u3053\u3057\u307e\u3059\uff1b\u3042\u308b\u30e6\u30fc\u30b6\u30fc\u306b\u306f\u30b5\u30a4\u30c8\u304c\u52d5\u4f5c\u3057\u3066\u3044\u308b\u3088\u3046\u306b\u898b\u3048\u3001\u5225\u306e\u30e6\u30fc\u30b6\u30fc\u306b\u306f\u5230\u9054\u4e0d\u80fd\u306b\u898b\u3048\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u3046\u3057\u305f\u4e0d\u6574\u5408\u6027\u306b\u3088\u308a\u3001<b>TCP \u76e3\u8996<\/b> \u306f\u30a6\u30a7\u30d6\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u7a3c\u50cd\u6027\u306e\u6226\u7565\u306b\u304a\u3044\u3066\u91cd\u8981\u306a\u5c64\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<h3 id='\u4e00\u822c\u7684\u306a-tcp-\u30a8\u30e9\u30fc\u3068\u305d\u306e\u610f\u5473'  id=\"boomdevs_11\">\u4e00\u822c\u7684\u306a TCP \u30a8\u30e9\u30fc\u3068\u305d\u306e\u610f\u5473<\/h3>\n<p>TCP \u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\u304c\u958b\u59cb\u3055\u308c\u308b\u3068\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u3068\u30b5\u30fc\u30d0\u30fc\u9593\u306e\u6b63\u5e38\u306a\u901a\u4fe1\u3092\u59a8\u3052\u308b\u3044\u304f\u3064\u304b\u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u95a2\u9023\u969c\u5bb3\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u3089\u306e TCP \u30a8\u30e9\u30fc\u306e\u7a2e\u985e\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u3067\u3001\u3069\u3053\u3067\u63a5\u7d9a\u304c\u9014\u5207\u308c\u3066\u3044\u308b\u304b\u3001\u3069\u306e\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\uff08\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3001\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\uff09\u306b\u6ce8\u76ee\u3059\u3079\u304d\u304b\u3092\u8fc5\u901f\u306b\u8a3a\u65ad\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u306f\u6700\u3082\u4e00\u822c\u7684\u306a TCP \u63a5\u7d9a\u30a8\u30e9\u30fc\u3068\u305d\u306e\u5178\u578b\u7684\u306a\u610f\u5473\u3067\u3059\uff1a<\/p>\n<h4 id='1-connection-refused-\u63a5\u7d9a\u62d2\u5426'  id=\"boomdevs_12\">1. Connection Refused\uff08\u63a5\u7d9a\u62d2\u5426\uff09<\/h4>\n<p>\u3053\u306e\u30a8\u30e9\u30fc\u306f\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u30bf\u30fc\u30b2\u30c3\u30c8\u30db\u30b9\u30c8\u306b\u6b63\u5e38\u306b\u5230\u9054\u3057\u305f\u304c\u3001\u671f\u5f85\u3055\u308c\u308b\u30dd\u30fc\u30c8\u3067\u30b5\u30fc\u30d3\u30b9\u304c\u30ea\u30c3\u30b9\u30f3\u3057\u3066\u3044\u306a\u3044\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002<\/p>\n<p>\u4e00\u822c\u7684\u306a\u539f\u56e0\uff1a<\/p>\n<ul>\n<li aria-level=\"1\">Web \u307e\u305f\u306f\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30b5\u30fc\u30d3\u30b9\u306e\u4e88\u671f\u305b\u306c\u30af\u30e9\u30c3\u30b7\u30e5<\/li>\n<li aria-level=\"1\">\u30b3\u30f3\u30c6\u30ca\u3084 VM \u306e\u7d42\u4e86\u307e\u305f\u306f\u518d\u30c7\u30d7\u30ed\u30a4<\/li>\n<li aria-level=\"1\">\u8ca0\u8377\u5206\u6563\u306e\u8a2d\u5b9a\u30df\u30b9\u3084\u30dd\u30fc\u30c8\u30d0\u30a4\u30f3\u30c9\u306e\u8aa4\u8a2d\u5b9a<\/li>\n<\/ul>\n<p><b>\u7c21\u5358\u306a\u4f8b<\/b>\uff1aWeb \u30b5\u30fc\u30d0\u30fc\u304c\u30dd\u30fc\u30c8 443\uff08HTTPS\uff09\u306b\u30d0\u30a4\u30f3\u30c9\u3055\u308c\u3066\u3044\u306a\u3044\u3068\u3001\u57fa\u76e4\u3068\u306a\u308b\u30b5\u30fc\u30d0\u30fc\u304c\u7a3c\u50cd\u3057\u3066\u3044\u3066\u3082\u30b5\u30a4\u30c8\u306f\u300c\u30c0\u30a6\u30f3\u300d\u306b\u898b\u3048\u307e\u3059\u3002<\/p>\n<blockquote><p><b>\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/b>: TCP \u30dd\u30fc\u30c8\u76e3\u8996\u3092\u4f7f\u7528\u3057\u3066\u3001\u30b5\u30fc\u30d3\u30b9\u304c\u6b63\u3057\u304f\u30d0\u30a4\u30f3\u30c9\u3055\u308c\u3001\u3059\u3079\u3066\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3067\u30ea\u30c3\u30b9\u30f3\u3057\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002Dotcom-Monitor \u306f\u30dd\u30fc\u30c8\u306e\u53ef\u7528\u6027\u3092\u7d99\u7d9a\u7684\u306b\u30c6\u30b9\u30c8\u3057\u3001\u30b5\u30fc\u30d3\u30b9\u304c\u5fdc\u7b54\u3092\u505c\u6b62\u3057\u305f\u3068\u304d\u306b\u30c1\u30fc\u30e0\u306b\u901a\u77e5\u3067\u304d\u307e\u3059\u3002<\/p><\/blockquote>\n<h4 id='2-connection-timed-out-\u63a5\u7d9a\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8'  id=\"boomdevs_13\"><b><\/b> 2. Connection Timed Out\uff08\u63a5\u7d9a\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\uff09<\/h4>\n<p><b>TCP \u30bf\u30a4\u30e0\u30a2\u30a6\u30c8<\/b> \u306f\u3001\u30d1\u30b1\u30c3\u30c8\u304c\u76ee\u7684\u5730\u307e\u3067\u306e\u30eb\u30fc\u30c8\u4e0a\u3067\u5931\u308f\u308c\u305f\u308a\u30d6\u30ed\u30c3\u30af\u3055\u308c\u305f\u308a\u3057\u305f\u3068\u304d\u306b\u767a\u751f\u3057\u307e\u3059\u3002<br \/>\n\u5178\u578b\u7684\u306a\u6839\u672c\u539f\u56e0\u306f\uff1a<\/p>\n<ul>\n<li aria-level=\"1\">\u30d1\u30b1\u30c3\u30c8\u3092\u9759\u304b\u306b\u30c9\u30ed\u30c3\u30d7\u3059\u308b\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb<\/li>\n<li aria-level=\"1\">\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u7d4c\u8def\u306e\u8f3b\u8f33\u3084\u4e0d\u5b89\u5b9a\u6027<\/li>\n<li aria-level=\"1\">\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u8a2d\u5b9a\u306e\u8aa4\u308a\u3084 ISP \u30ec\u30d9\u30eb\u306e\u554f\u984c<\/li>\n<\/ul>\n<p>\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u306f\u7279\u306b\u8a3a\u65ad\u30d5\u30a3\u30fc\u30c9\u30d0\u30c3\u30af\u3092\u63d0\u4f9b\u3057\u306a\u3044\u305f\u3081\u30d5\u30e9\u30b9\u30c8\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u751f\u307f\u307e\u3059\uff1b\u30e6\u30fc\u30b6\u30fc\u306f\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304c\u8ae6\u3081\u308b\u307e\u3067\u305f\u3060\u30ed\u30fc\u30c7\u30a3\u30f3\u30b0\u3092\u898b\u7d9a\u3051\u307e\u3059\u3002<\/p>\n<blockquote><p><b>\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\uff1a<\/b>\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30db\u30c3\u30d7\u3068\u9045\u5ef6\u3092\u8ffd\u8de1\u3059\u308b\u30c4\u30fc\u30eb\u3092\u7528\u3044\u305f <b>TCP \u30d1\u30b9\u76e3\u8996<\/b> \u3092\u5b9f\u88c5\u3057\u3066\u304f\u3060\u3055\u3044\u3002Dotcom-Monitor \u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u8a3a\u65ad\u306f\u30d1\u30b1\u30c3\u30c8\u30d5\u30ed\u30fc\u3092\u53ef\u8996\u5316\u3057\u3001\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u304c\u767a\u751f\u3057\u3066\u3044\u308b\u6b63\u78ba\u306a\u7b87\u6240\u3092\u7279\u5b9a\u3057\u307e\u3059\u3002<\/p><\/blockquote>\n<h4 id='3-connection-reset-\u63a5\u7d9a\u30ea\u30bb\u30c3\u30c8'  id=\"boomdevs_14\">3. Connection Reset\uff08\u63a5\u7d9a\u30ea\u30bb\u30c3\u30c8\uff09<\/h4>\n<p>\u3053\u308c\u306f TCP \u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\u304c\u5b8c\u4e86\u3057\u305f\u304c\u3001\u305d\u306e\u5f8c\u7a81\u7136\u7d42\u4e86\u3057\u305f\u3068\u304d\u306b\u767a\u751f\u3057\u307e\u3059\u3002<br \/>\n\u983b\u7e41\u306a\u539f\u56e0\u306b\u306f\uff1a<\/p>\n<ul>\n<li aria-level=\"1\">\u904e\u8ca0\u8377\u306e\u30d7\u30ed\u30ad\u30b7\u3084\u30b5\u30fc\u30d0\u30fc\u304c\u63a5\u7d9a\u3092\u65e9\u671f\u306b\u5207\u65ad\u3059\u308b<\/li>\n<li aria-level=\"1\">\u8ca0\u8377\u5206\u6563\u88c5\u7f6e\u306e\u7a7a\u304d\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u8a2d\u5b9a\u304c\u53b3\u3057\u3059\u304e\u308b<\/li>\n<li aria-level=\"1\">WAF \u7b49\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30df\u30c9\u30eb\u30dc\u30c3\u30af\u30b9\u304c\u7591\u308f\u3057\u3044\u30bb\u30c3\u30b7\u30e7\u30f3\u3092\u62d2\u5426\u3059\u308b<\/li>\n<\/ul>\n<p>\u30ea\u30bb\u30c3\u30c8\u306f\u3057\u3070\u3057\u3070\u518d\u73fe\u304c\u96e3\u3057\u3044\u65ad\u7d9a\u7684\u306a\u30a8\u30e9\u30fc\u3068\u3057\u3066\u73fe\u308c\u3001\u7279\u306b\u5206\u6563\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u3084 CDN \u74b0\u5883\u3067\u306f\u8ffd\u8de1\u304c\u56f0\u96e3\u3067\u3059\u3002<\/p>\n<blockquote><p><b>\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\uff1a<\/b>\u7d99\u7d9a\u7684\u306a <b>TCP \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u76e3\u8996<\/b> \u3092\u4f7f\u3044\u3001\u30ea\u30bb\u30c3\u30c8\u306e\u30d1\u30bf\u30fc\u30f3\u3092\u691c\u51fa\u3057\u3066\u8ca0\u8377\u3001\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30dd\u30ea\u30b7\u30fc\u3001\u307e\u305f\u306f\u7279\u5b9a\u306e\u30d7\u30ed\u30ad\u30b7\u6319\u52d5\u3068\u76f8\u95a2\u3055\u305b\u307e\u3059\u3002<\/p><\/blockquote>\n<p>\u3053\u306e\u3088\u3046\u306b\u30a8\u30e9\u30fc\u3092\u5206\u985e\u3059\u308b\u3053\u3068\u3067\u3001\u30c1\u30fc\u30e0\u306f\u554f\u984c\u306e\u7bc4\u56f2\u3092\u8fc5\u901f\u306b\u7d5e\u308a\u8fbc\u3081\u307e\u3059\uff1a<\/p>\n<ul>\n<li aria-level=\"1\">\u3082\u3057 <b>TCP \u304c\u5931\u6557<\/b> \u3057\u3066\u3044\u308b\u306a\u3089\u3001<b>DNS \u306f\u6b63\u5e38<\/b> \u3060\u304c\u63a5\u7d9a\u304c\u78ba\u7acb\u3067\u304d\u306a\u3044\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002<\/li>\n<li aria-level=\"1\">\u3053\u306e\u660e\u78ba\u3055\u306f\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u6642\u9593\u3092\u77ed\u7e2e\u3057\u3001\u4fee\u6b63\u3092\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3001\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u3001\u307e\u305f\u306f\u30a4\u30f3\u30d5\u30e9\u904b\u7528\u306e\u6b63\u3057\u3044\u62c5\u5f53\u306b\u5c0e\u304d\u307e\u3059\u3002<\/li>\n<\/ul>\n<h2 id='tcp-\u3092\u52b9\u679c\u7684\u306b\u76e3\u8996\u3059\u308b\u65b9\u6cd5'  id=\"boomdevs_15\">TCP \u3092\u52b9\u679c\u7684\u306b\u76e3\u8996\u3059\u308b\u65b9\u6cd5<\/h2>\n<p>\u5358\u7d14\u306a <b>ICMP ping<\/b> \u306e\u3088\u3046\u306a\u57fa\u672c\u7684\u306a\u7a3c\u50cd\u30c1\u30a7\u30c3\u30af\u306f\u8aa4\u3063\u305f\u5b89\u5fc3\u611f\u3092\u751f\u3080\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u30b5\u30fc\u30d0\u30fc\u304c ping \u306b\u5fdc\u7b54\u3057\u3066\u3044\u3066\u3082\u3001<b>TCP \u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af<\/b> \u3092\u5b8c\u4e86\u3067\u304d\u306a\u3044\u5834\u5408\u304c\u3042\u308a\u3001\u305d\u306e\u5834\u5408\u306f\u30e6\u30fc\u30b6\u30fc\u304c\u5b9f\u969b\u306b\u63a5\u7d9a\u3067\u304d\u306a\u3044\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002<\/p>\n<p>\u771f\u306e <b>TCP \u76e3\u8996<\/b> \u306f\u3001\u5b9f\u4e16\u754c\u306e\u63a5\u7d9a\u6319\u52d5\u3092\u691c\u8a3c\u3057\u3001\u57fa\u672c\u7684\u306a ping \u30c6\u30b9\u30c8\u3067\u306f\u898b\u9003\u3055\u308c\u308b\u554f\u984c\u3092\u691c\u51fa\u3057\u307e\u3059\u3002\u9069\u5207\u306a\u65b9\u6cd5\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\uff1a<\/p>\n<h3 id='1-\u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\u306e\u691c\u8a3c'  id=\"boomdevs_16\">1. \u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\u306e\u691c\u8a3c<\/h3>\n<p>\u6709\u52b9\u306a TCP \u76e3\u8996\u306f\u3001\u5b9f\u969b\u306e\u30b5\u30fc\u30d3\u30b9\u30dd\u30fc\u30c8\uff08\u4f8b\uff1aHTTP \u306f 80\u3001HTTPS \u306f 443\uff09\u3067\u306e <b>SYN\/SYN-ACK\/ACK<\/b> \u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\u306e\u691c\u8a3c\u304b\u3089\u59cb\u307e\u308a\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u306b\u3088\u308a\u3001\u30b5\u30fc\u30d0\u30fc\u304c\u5358\u306b\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u5c64\u3067\u300c\u751f\u304d\u3066\u3044\u308b\u300d\u3060\u3051\u3067\u306a\u304f\u3001\u5b9f\u969b\u306b\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u3092\u53d7\u3051\u5165\u308c\u308b\u305f\u3081\u306b\u30ea\u30c3\u30b9\u30f3\u3057\u3066\u3044\u308b\u3053\u3068\u304c\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002<\/p>\n<blockquote><p><b>\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\uff1a<\/b>\u5408\u6210\u76e3\u8996\u30c4\u30fc\u30eb\uff08\u4f8b\uff1a<b>Dotcom-Monitor \u306e\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u76e3\u8996<\/b>\uff09\u3092\u4f7f\u7528\u3057\u3066\u3001\u5b8c\u5168\u306a TCP \u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\u3092\u81ea\u52d5\u7684\u306b\u8a66\u884c\u3057\u3001\u5404\u30b5\u30fc\u30d3\u30b9\u30a8\u30f3\u30c9\u30dd\u30a4\u30f3\u30c8\u304c\u3059\u3079\u3066\u306e\u30ce\u30fc\u30c9\u3067\u6b63\u3057\u304f\u5fdc\u7b54\u3059\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p><\/blockquote>\n<h3 id='2-\u5730\u57df\u6a2a\u65ad\u306e\u30d1\u30b9\u5206\u6790'  id=\"boomdevs_17\">2. \u5730\u57df\u6a2a\u65ad\u306e\u30d1\u30b9\u5206\u6790<\/h3>\n<p>\u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\u306e\u6210\u529f\u306f\u63a5\u7d9a\u30d1\u30b9\u4e0a\u306e\u3059\u3079\u3066\u306e\u30ea\u30f3\u30af\u306b\u4f9d\u5b58\u3057\u307e\u3059\u3002\u8907\u6570\u306e\u5730\u7406\u7684\u9818\u57df\u304b\u3089\u306e <b>traceroute<\/b> \u3084 <b>MTR\uff08My Traceroute\uff09<\/b> \u3092\u4f7f\u7528\u3057\u3066\u3001\u30d1\u30b1\u30c3\u30c8\u304c\u30c7\u30fc\u30bf\u30bb\u30f3\u30bf\u30fc\u3001CDN \u30a8\u30c3\u30b8\u3001\u307e\u305f\u306f\u4e0a\u6d41 ISP \u306e\u3069\u306e\u5730\u70b9\u3067\u9045\u5ef6\u307e\u305f\u306f\u505c\u6b62\u3057\u3066\u3044\u308b\u304b\u3092\u660e\u3089\u304b\u306b\u3057\u307e\u3059\u3002<\/p>\n<blockquote><p><b>\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\uff1a<\/b>\u5730\u57df\u5206\u6563\u3055\u308c\u305f TCP \u30d1\u30b9\u30c1\u30a7\u30c3\u30af\u3092\u5b9f\u884c\u3057\u3001\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u3084\u8f3b\u8f33\u306e\u554f\u984c\u3092\u65e9\u671f\u306b\u691c\u51fa\u3057\u307e\u3059\u3002Dotcom-Monitor \u306e\u30b0\u30ed\u30fc\u30d0\u30eb\u76e3\u8996\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u306b\u5f71\u97ff\u304c\u51fa\u308b\u524d\u306b\u5730\u57df\u306e\u7570\u5e38\u3092\u7279\u5b9a\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/p><\/blockquote>\n<h3 id='3-\u30d7\u30ed\u30c8\u30b3\u30eb\u306e\u6574\u5408\u6027-ipv4-\u3068-ipv6-\u306e\u76e3\u8996'  id=\"boomdevs_18\">3. \u30d7\u30ed\u30c8\u30b3\u30eb\u306e\u6574\u5408\u6027\uff08IPv4 \u3068 IPv6 \u306e\u76e3\u8996\uff09<\/h3>\n<p>\u591a\u304f\u306e\u7d44\u7e54\u306f\u73fe\u5728 <b>IPv4 \u3068 IPv6<\/b> \u306e\u4e21\u65b9\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u307e\u3059\u304c\u3001\u5b9f\u969b\u306e\u969c\u5bb3\u306f\u4e00\u65b9\u306e\u30d7\u30ed\u30c8\u30b3\u30eb\u3060\u3051\u306b\u5f71\u97ff\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002IPv4 \u306e\u307f\u3092\u30c6\u30b9\u30c8\u3057\u3066\u3044\u308b\u3068\u3001IPv6 \u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u3067\u767a\u751f\u3059\u308b\u30e6\u30fc\u30b6\u30fc\u5f71\u97ff\u306e\u554f\u984c\u3092\u898b\u9003\u3059\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<blockquote><p><b>\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\uff1a<\/b>\u76e3\u8996\u69cb\u6210\u306b\u306f\u5e38\u306b\u4e21\u65b9\u306e\u30d7\u30ed\u30c8\u30b3\u30eb\u3092\u542b\u3081\u3066\u304f\u3060\u3055\u3044\u3002Dotcom-Monitor \u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u30c7\u30e5\u30a2\u30eb\u30b9\u30bf\u30c3\u30af\u30c1\u30a7\u30c3\u30af\u3092\u5b9f\u884c\u3057\u3066\u63a5\u7d9a\u30bf\u30a4\u30d7\u9593\u306e\u4e00\u8cab\u6027\u3092\u78ba\u4fdd\u3057\u3001\u30d1\u30ea\u30c6\u30a3\u554f\u984c\u3092\u691c\u51fa\u3067\u304d\u307e\u3059\u3002<\/p><\/blockquote>\n<h3 id='\u306a\u305c-tcp-\u76e3\u8996\u304c\u91cd\u8981\u304b'  id=\"boomdevs_19\">\u306a\u305c TCP \u76e3\u8996\u304c\u91cd\u8981\u304b<\/h3>\n<p>DNS \u3084 HTTP \u30c1\u30a7\u30c3\u30af\u306b\u52a0\u3048\u305f TCP \u76e3\u8996\u306f\u3001\u30b5\u30fc\u30d0\u30fc\u304c <b>\u5b9f\u969b\u306e\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u53d7\u3051\u5165\u308c\u6e96\u5099\u304c\u3067\u304d\u3066\u3044\u308b\u304b<\/b> \u3092\u691c\u8a3c\u3057\u307e\u3059\u3002\u3082\u3057 TCP \u304c\u5931\u6557\u3057\u3066\u3044\u308b\u306a\u3089\u3001DNS \u306f\u89e3\u6790\u3055\u308c\u3066\u3044\u308b\u304c\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u63a5\u7d9a\u304c\u78ba\u7acb\u3067\u304d\u306a\u3044\u3053\u3068\u3092\u610f\u5473\u3057\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u6d1e\u5bdf\u306b\u3088\u308a\u3001\u30c1\u30fc\u30e0\u306f\u5373\u5ea7\u306b\u30c8\u30ea\u30a2\u30fc\u30b8\u3067\u304d\u307e\u3059\uff1a<\/p>\n<ul>\n<li aria-level=\"1\">DNS \u306f\u6b63\u5e38 \u2192 \u30b5\u30fc\u30d0\u30fc\u3001\u30d5\u30a1\u30a4\u30a2\u30a6\u30a9\u30fc\u30eb\u3001\u307e\u305f\u306f\u8ca0\u8377\u5206\u6563\u88c5\u7f6e\u306b\u6ce8\u76ee\u3002<\/li>\n<li aria-level=\"1\">\u4e0d\u5fc5\u8981\u306b\u958b\u767a\u30c1\u30fc\u30e0\u3084\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30c1\u30fc\u30e0\u3078\u30a8\u30b9\u30ab\u30ec\u30fc\u30b7\u30e7\u30f3\u3059\u308b\u5fc5\u8981\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/li>\n<\/ul>\n<p>\u5206\u5c64\u5316\u3055\u308c\u305f TCP \u76e3\u8996\u3092\u5c0e\u5165\u3059\u308b\u3053\u3068\u3067\u3001\u7d44\u7e54\u306f\u3088\u308a\u901f\u3044\u30a4\u30f3\u30b7\u30c7\u30f3\u30c8\u5bfe\u5fdc\u3001\u30c0\u30a6\u30f3\u30bf\u30a4\u30e0\u306e\u524a\u6e1b\u3001\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u4fe1\u983c\u6027\u306e\u5411\u4e0a\u3092\u5b9f\u73fe\u3057\u307e\u3059\u3002<\/p>\n<h2 id='tls-ssl-\u30a8\u30e9\u30fc'  id=\"boomdevs_20\">TLS\/SSL \u30a8\u30e9\u30fc<\/h2>\n<p>\u73fe\u4ee3\u306e\u30a6\u30a7\u30d6\u74b0\u5883\u3067\u306f\u3001HTTPS \u306f\u3082\u306f\u3084\u30aa\u30d7\u30b7\u30e7\u30f3\u3067\u306f\u306a\u304f\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u3059\u3002TCP \u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\u306e\u5f8c\u3001\u30d6\u30e9\u30a6\u30b6\u3068\u30a6\u30a7\u30d6\u30b5\u30fc\u30d0\u30fc\u306f\u63a5\u7d9a\u3092\u4fdd\u8b77\u3059\u308b\u305f\u3081\u306b TLS\uff08Transport Layer Security\uff09\u30bb\u30c3\u30b7\u30e7\u30f3\u3092\u958b\u59cb\u3057\u307e\u3059\u3002<\/p>\n<p>TLS \u306f\u4e8c\u3064\u306e\u91cd\u8981\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u307e\u3059\uff1a<\/p>\n<ol>\n<li aria-level=\"1\"><b>\u6697\u53f7\u5316\uff1a<\/b>\u30d6\u30e9\u30a6\u30b6\u3068\u30b5\u30fc\u30d0\u30fc\u9593\u3067\u9001\u53d7\u4fe1\u3055\u308c\u308b\u3059\u3079\u3066\u306e\u30c7\u30fc\u30bf\u3092\u508d\u53d7\u304b\u3089\u4fdd\u8b77\u3057\u307e\u3059\u3002<\/li>\n<li aria-level=\"1\"><b>\u8a8d\u8a3c\uff1a<\/b>\u30b5\u30fc\u30d0\u30fc\u304c\u6b63\u5f53\u3067\u3042\u308b\u3053\u3068\u3092<b>\u30c7\u30b8\u30bf\u30eb\u8a3c\u660e\u66f8<\/b>\u306e\u691c\u8a3c\u306b\u3088\u3063\u3066\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<p>TLS \u304c\u306a\u3044\u3068\u30e6\u30fc\u30b6\u30fc\u306f\u91cd\u5927\u306a\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u3084\u30d7\u30e9\u30a4\u30d0\u30b7\u30fc\u306e\u30ea\u30b9\u30af\u306b\u3055\u3089\u3055\u308c\u307e\u3059\u3002\u3057\u304b\u3057\u3001TLS \u304c\u3042\u3063\u3066\u3082\u8a2d\u5b9a\u30df\u30b9\u3084\u8a3c\u660e\u66f8\u306e\u671f\u9650\u5207\u308c\u306f\u91cd\u5927\u306a\u554f\u984c\u3092\u5f15\u304d\u8d77\u3053\u3059\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>TLS \u304c\u5931\u6557\u3059\u308b\u3068\u3001\u30e6\u30fc\u30b6\u30fc\u306f <i>\u300cYour connection is not private\u300d<\/i> \u3084 <i>\u300cThis site\u2019s certificate is invalid.\u300d<\/i> \u306e\u3088\u3046\u306a\u30d6\u30e9\u30a6\u30b6\u8b66\u544a\u3092\u898b\u308b\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u30e1\u30c3\u30bb\u30fc\u30b8\u306f\u5373\u5ea7\u306b\u4fe1\u983c\u3092\u640d\u306a\u3044\u3001\u591a\u304f\u306e\u5834\u5408\u30e6\u30fc\u30b6\u30fc\u304c\u5148\u306b\u9032\u3080\u306e\u3092\u963b\u6b62\u3057\u307e\u3059\u3002<\/p>\n<p>\u3057\u305f\u304c\u3063\u3066\u3001<b>TLS\/SSL \u76e3\u8996<\/b> \u306f\u7a3c\u50cd\u6027\u3068\u4fe1\u983c\u6027\u3092\u7dad\u6301\u3059\u308b\u305f\u3081\u306b\u4e0d\u53ef\u6b20\u3067\u3059\u30021 \u3064\u306e\u671f\u9650\u5207\u308c\u8a3c\u660e\u66f8\u304c\u4e00\u6669\u3067\u30b5\u30a4\u30c8\u3092\u30c0\u30a6\u30f3\u3055\u305b\u3001\u8a55\u5224\u3092\u50b7\u3064\u3051\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h3 id='tls-ssl-\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3059\u308b\u7406\u7531'  id=\"boomdevs_21\">TLS\/SSL \u30a8\u30e9\u30fc\u304c\u767a\u751f\u3059\u308b\u7406\u7531<\/h3>\n<p>TLS \u306e\u554f\u984c\u306f\u591a\u304f\u306e\u5834\u5408\u8a2d\u5b9a\u30df\u30b9\u3084\u66f4\u65b0\u5fd8\u308c\u306b\u8d77\u56e0\u3057\u307e\u3059\u3002\u4e00\u822c\u7684\u306a\u539f\u56e0\u306f\uff1a<\/p>\n<ul>\n<li aria-level=\"1\"><b>\u8a3c\u660e\u66f8\u306e\u671f\u9650\u5207\u308c<\/b> \u2014 \u671f\u9650\u524d\u306b\u66f4\u65b0\u3055\u308c\u306a\u3044\u8a3c\u660e\u66f8\u306f\u5373\u5ea7\u306b\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30a8\u30e9\u30fc\u3092\u5f15\u304d\u8d77\u3053\u3057\u3001\u30a2\u30af\u30bb\u30b9\u3092\u30d6\u30ed\u30c3\u30af\u3057\u307e\u3059\u3002<\/li>\n<li aria-level=\"1\"><b>\u30db\u30b9\u30c8\u540d\u306e\u4e0d\u4e00\u81f4<\/b> \u2014 \u4f8b\u3048\u3070 www.example.com \u7528\u306b\u767a\u884c\u3055\u308c\u305f\u8a3c\u660e\u66f8\u3092 api.example.com \u3067\u4f7f\u3046\u3068\u691c\u8a3c\u306b\u5931\u6557\u3057\u307e\u3059\u3002<\/li>\n<li aria-level=\"1\"><b>\u4fe1\u983c\u3055\u308c\u3066\u3044\u306a\u3044\u8a3c\u660e\u66f8\u767a\u884c\u6a5f\u95a2\uff08CA\uff09<\/b> \u2014 \u8a3c\u660e\u66f8\u304c\u81ea\u5df1\u7f72\u540d\u3067\u3042\u308b\u304b\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306b\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3055\u308c\u3066\u3044\u306a\u3044\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u30eb\u30fc\u30c8\u306b\u30c1\u30a7\u30fc\u30f3\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u3001\u30d6\u30e9\u30a6\u30b6\u306f CA \u3092\u8a8d\u8b58\u3057\u307e\u305b\u3093\u3002<\/li>\n<li aria-level=\"1\"><b>\u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\u5931\u6557<\/b> \u2014 \u6697\u53f7\u4ea4\u6e09\u304c\u5931\u6557\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u3001\u3053\u308c\u306f\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u3044\u306a\u3044\u6697\u53f7\u30b9\u30a4\u30fc\u30c8\u3001\u5ec3\u6b62\u3055\u308c\u305f\u30d7\u30ed\u30c8\u30b3\u30eb\u30d0\u30fc\u30b8\u30e7\u30f3\u3001\u307e\u305f\u306f\u4e0d\u5b8c\u5168\u306a\u8a3c\u660e\u66f8\u30c1\u30a7\u30fc\u30f3\u304c\u539f\u56e0\u3068\u306a\u308b\u3053\u3068\u304c\u591a\u3044\u3067\u3059\u3002<\/li>\n<\/ul>\n<p>\u3053\u308c\u3089\u306e\u30a8\u30e9\u30fc\u306f\u30e6\u30fc\u30b6\u30fc\u306e\u4fe1\u983c\u6027\u3068\u30a2\u30af\u30bb\u30b9\u6027\u306b\u5f71\u97ff\u3059\u308b\u305f\u3081\u3001\u7d99\u7d9a\u7684\u306a TLS \u76e3\u8996\u304c\u65e9\u671f\u691c\u51fa\u306b\u4e0d\u53ef\u6b20\u3067\u3059\u3002<\/p>\n<h3 id='tls-ssl-\u3092\u52b9\u679c\u7684\u306b\u76e3\u8996\u3059\u308b\u65b9\u6cd5'  id=\"boomdevs_22\">TLS\/SSL \u3092\u52b9\u679c\u7684\u306b\u76e3\u8996\u3059\u308b\u65b9\u6cd5<\/h3>\n<p>TLS \u8a3c\u660e\u66f8\u306f\u5f90\u3005\u306b\u58ca\u308c\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\uff1b\u3042\u308b\u65e5\u6b63\u5e38\u306b\u52d5\u4f5c\u3057\u3066\u3044\u3066\u3082\u6b21\u306e\u65e5\u306b\u30a2\u30af\u30bb\u30b9\u3092\u30d6\u30ed\u30c3\u30af\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u6700\u826f\u306e\u76e3\u8996\u30a2\u30d7\u30ed\u30fc\u30c1\u306f <b>\u30d7\u30ed\u30a2\u30af\u30c6\u30a3\u30d6\u3067\u81ea\u52d5\u5316\u3055\u308c\u305f\u3082\u306e<\/b> \u3067\u3059\u3002<\/p>\n<p>\u4fe1\u983c\u6027\u306e\u9ad8\u3044 TLS \u76e3\u8996\u3092\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5\u306f\u6b21\u306e\u901a\u308a\u3067\u3059\uff1a<\/p>\n<h4 id='1-\u8a3c\u660e\u66f8\u306e\u6709\u52b9\u6027\u3092\u8ffd\u8de1\u3059\u308b'  id=\"boomdevs_23\">1. \u8a3c\u660e\u66f8\u306e\u6709\u52b9\u6027\u3092\u8ffd\u8de1\u3059\u308b<\/h4>\n<p>\u30c9\u30e1\u30a4\u30f3\u3084\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u5168\u4f53\u306e SSL\/TLS \u8a3c\u660e\u66f8\u306e\u6709\u52b9\u671f\u9650\u3092\u76e3\u8996\u3057\u307e\u3059\u3002\u8907\u6570\u306e\u30a2\u30e9\u30fc\u30c8\u95be\u5024\uff08\u4f8b\uff1a\u671f\u9650 30 \u65e5\u524d\u30017 \u65e5\u524d\u30011 \u65e5\u524d\uff09\u3092\u8a2d\u5b9a\u3057\u3001\u671f\u9650\u5207\u308c\u524d\u306b\u66f4\u65b0\u304c\u884c\u308f\u308c\u308b\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n<h4 id='2-\u5b8c\u5168\u306a\u8a3c\u660e\u66f8\u30c1\u30a7\u30fc\u30f3\u3092\u691c\u8a3c\u3059\u308b'  id=\"boomdevs_24\">2. \u5b8c\u5168\u306a\u8a3c\u660e\u66f8\u30c1\u30a7\u30fc\u30f3\u3092\u691c\u8a3c\u3059\u308b<\/h4>\n<p>\u4e0d\u5b8c\u5168\u307e\u305f\u306f\u8aa4\u8a2d\u5b9a\u306e\u8a3c\u660e\u66f8\u30c1\u30a7\u30fc\u30f3\u306f\u3001\u4e3b\u8a3c\u660e\u66f8\u304c\u6709\u52b9\u3067\u3042\u3063\u3066\u3082\u4fe1\u983c\u3092\u58ca\u3059\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u5730\u57df\u3054\u3068\u306b\u8a3c\u660e\u66f8\u30c1\u30a7\u30fc\u30f3\u3092\u5b9a\u671f\u7684\u306b\u30c6\u30b9\u30c8\u3057\u3001CA \u3084\u4e2d\u9593\u8a3c\u660e\u66f8\u306e\u554f\u984c\u3092\u30e6\u30fc\u30b6\u30fc\u304c\u906d\u9047\u3059\u308b\u524d\u306b\u691c\u51fa\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h4 id='3-\u30d7\u30ed\u30c8\u30b3\u30eb\u3068\u6697\u53f7\u30b9\u30a4\u30fc\u30c8\u306e\u4e92\u63db\u6027\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b'  id=\"boomdevs_25\">3. \u30d7\u30ed\u30c8\u30b3\u30eb\u3068\u6697\u53f7\u30b9\u30a4\u30fc\u30c8\u306e\u4e92\u63db\u6027\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b<\/h4>\n<p>\u30d6\u30e9\u30a6\u30b6\u306f\u53e4\u3044\u30d7\u30ed\u30c8\u30b3\u30eb\uff08\u4f8b\uff1a<b>TLS 1.0\/1.1<\/b>\uff09\u3084\u5f31\u3044\u6697\u53f7\u3092\u6bb5\u968e\u7684\u306b\u5ec3\u6b62\u3057\u3066\u3044\u307e\u3059\u3002\u30b5\u30fc\u30d0\u30fc\u304c\u307e\u3060\u5ec3\u6b62\u3055\u308c\u305f\u8a2d\u5b9a\u306b\u4f9d\u5b58\u3057\u3066\u3044\u308b\u5834\u5408\u3001\u30e6\u30fc\u30b6\u30fc\u306f\u5b89\u5168\u306b\u63a5\u7d9a\u3067\u304d\u306a\u3044\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u76e3\u8996\u30c4\u30fc\u30eb\u306f\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u308b <b>\u6697\u53f7\u30b9\u30a4\u30fc\u30c8<\/b> \u3068 <b>\u30d7\u30ed\u30c8\u30b3\u30eb\u30d0\u30fc\u30b8\u30e7\u30f3<\/b> \u3092\u691c\u8a3c\u3059\u308b\u3079\u304d\u3067\u3059\u3002<\/p>\n<h4 id='4-\u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\u5931\u6557\u3092\u76e3\u8996\u3059\u308b'  id=\"boomdevs_26\">4. \u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\u5931\u6557\u3092\u76e3\u8996\u3059\u308b<\/h4>\n<p>TLS \u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\u30a8\u30e9\u30fc\u306e\u6025\u5897\u306f\u3001\u8ca0\u8377\u5206\u6563\u5668\u306e\u8aa4\u8a2d\u5b9a\u3001\u671f\u9650\u5207\u308c\u4e2d\u9593\u8a3c\u660e\u66f8\u3001\u307e\u305f\u306f\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30ec\u30d9\u30eb\u306e\u554f\u984c\u3092\u793a\u3059\u3053\u3068\u304c\u591a\u3044\u3067\u3059\u3002<\/p>\n<h3 id='tls-\u76e3\u8996\u304c\u91cd\u8981\u306a\u7406\u7531'  id=\"boomdevs_27\">TLS \u76e3\u8996\u304c\u91cd\u8981\u306a\u7406\u7531<\/h3>\n<p>TLS \u306e\u30a8\u30e9\u30fc\u306f\u5358\u306a\u308b\u6280\u8853\u7684\u554f\u984c\u3067\u306f\u306a\u304f\u3001<b>\u30d3\u30b8\u30cd\u30b9\u30af\u30ea\u30c6\u30a3\u30ab\u30eb<\/b> \u3067\u3059\u3002\u30e6\u30fc\u30b6\u30fc\u306e\u4fe1\u983c\u3001\u30d6\u30e9\u30f3\u30c9\u306e\u5370\u8c61\u3001\u30b3\u30f3\u30d0\u30fc\u30b8\u30e7\u30f3\u7387\u306b\u76f4\u63a5\u5f71\u97ff\u3057\u307e\u3059\u3002<\/p>\n<p>TLS \u76e3\u8996\u304c\u8a3c\u660e\u66f8\u3084\u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\u306e\u554f\u984c\u3092\u65e9\u671f\u306b\u8b66\u544a\u3059\u308c\u3070\u3001\u30c1\u30fc\u30e0\u306f\u30e6\u30fc\u30b6\u30fc\u306b\u5f71\u97ff\u304c\u51fa\u308b\u524d\u306b\u8fc5\u901f\u306b\u5bfe\u5fdc\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2 id='\u3088\u304f\u3042\u308b-tls-ssl-\u30a8\u30e9\u30fc'  id=\"boomdevs_28\">\u3088\u304f\u3042\u308b TLS\/SSL \u30a8\u30e9\u30fc<\/h2>\n<p>TLS\uff08Transport Layer Security\uff09\u304a\u3088\u3073 SSL\uff08Secure Sockets Layer\uff09\u30a8\u30e9\u30fc\u306f\u3001\u767a\u751f\u6642\u306b\u6700\u3082\u76ee\u306b\u898b\u3048\u3001\u8a55\u5224\u3092\u640d\u306a\u3046\u30a6\u30a7\u30d6\u4e0a\u306e\u554f\u984c\u306e\u4e00\u3064\u3067\u3059\u3002\u767a\u751f\u3059\u308b\u3068\u30e6\u30fc\u30b6\u30fc\u306f <b>\u300cYour connection is not private\u300d<\/b> \u3084 <b>\u300cThis website\u2019s security certificate has expired.\u300d<\/b> \u306e\u3088\u3046\u306a\u30d6\u30e9\u30a6\u30b6\u8b66\u544a\u306b\u76f4\u9762\u3057\u3001\u3053\u308c\u3089\u306f\u5373\u5ea7\u306b\u4fe1\u983c\u3092\u640d\u306d\u3001\u8a2a\u554f\u8005\u3092\u30b5\u30a4\u30c8\u304b\u3089\u9060\u3056\u3051\u307e\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u306f\u6700\u3082\u4e00\u822c\u7684\u306a <b>TLS\/SSL \u30a8\u30e9\u30fc<\/b>\u3001\u305d\u306e\u539f\u56e0\u3001\u304a\u3088\u3073\u7d99\u7d9a\u7684\u76e3\u8996\u304c\u4e88\u9632\u306b\u5f79\u7acb\u3064\u7406\u7531\u3067\u3059\u3002<\/p>\n<h3 id='\u671f\u9650\u5207\u308c\u8a3c\u660e\u66f8'  id=\"boomdevs_29\">\u671f\u9650\u5207\u308c\u8a3c\u660e\u66f8<\/h3>\n<p>\u671f\u9650\u5207\u308c\u306e SSL \u8a3c\u660e\u66f8\u306f HTTPS \u969c\u5bb3\u306e\u4e3b\u8981\u306a\u539f\u56e0\u306e\u4e00\u3064\u3067\u3059\u3002\u8a3c\u660e\u66f8\u306f\u6709\u9650\u306e\u6709\u52b9\u671f\u9593\uff08\u901a\u5e38 90 \u65e5\u304b\u3089 1 \u5e74\uff09\u3067\u767a\u884c\u3055\u308c\u307e\u3059\u3002\u671f\u9650\u524d\u306b\u66f4\u65b0\u3055\u308c\u306a\u3044\u3068\u3001\u30d6\u30e9\u30a6\u30b6\u306f\u30b5\u30a4\u30c8\u3092\u5b89\u5168\u3067\u306a\u3044\u3068\u8868\u793a\u3057\u30a2\u30af\u30bb\u30b9\u3092\u30d6\u30ed\u30c3\u30af\u3057\u307e\u3059\u3002<\/p>\n<p><b>\u306a\u305c\u8d77\u3053\u308b\u306e\u304b\uff1a<\/b><\/p>\n<ul>\n<li aria-level=\"1\">\u66f4\u65b0\u306e\u81ea\u52d5\u5316\u5931\u6557<\/li>\n<li aria-level=\"1\">\u8a3c\u660e\u66f8\u306e\u66f4\u65b0\u304c\u3059\u3079\u3066\u306e\u30b5\u30fc\u30d0\u30fc\u306b\u4f1d\u642c\u3057\u306a\u304b\u3063\u305f<\/li>\n<li aria-level=\"1\">\u8ca0\u8377\u5206\u6563\u5668\u306e\u8aa4\u8a2d\u5b9a\u3084\u30ad\u30e3\u30c3\u30b7\u30e5\u554f\u984c<\/li>\n<\/ul>\n<h3 id='\u30db\u30b9\u30c8\u540d\u4e0d\u4e00\u81f4'  id=\"boomdevs_30\">\u30db\u30b9\u30c8\u540d\u4e0d\u4e00\u81f4<\/h3>\n<p>\u30db\u30b9\u30c8\u540d\u4e0d\u4e00\u81f4\u306f\u3001\u8a3c\u660e\u66f8\u5185\u306e\u30c9\u30e1\u30a4\u30f3\u540d\u304c\u30e6\u30fc\u30b6\u30fc\u304c\u30a2\u30af\u30bb\u30b9\u3057\u3066\u3044\u308b URL \u3068\u4e00\u81f4\u3057\u306a\u3044\u5834\u5408\u306b\u767a\u751f\u3057\u307e\u3059\u3002\u4f8b\u3048\u3070 www.example.com \u7528\u306b\u767a\u884c\u3055\u308c\u305f\u8a3c\u660e\u66f8\u306f\u3001api.example.com \u3067\u4f7f\u7528\u3055\u308c\u308b\u3068\u691c\u8a3c\u306b\u5931\u6557\u3057\u307e\u3059\u3002<\/p>\n<p>\u306a\u305c\u8d77\u3053\u308b\u304b\uff1a<\/p>\n<ul>\n<li aria-level=\"1\">\u8a3c\u660e\u66f8\u767a\u884c\u5f8c\u306b\u30b5\u30d6\u30c9\u30e1\u30a4\u30f3\u3092\u8ffd\u52a0\u3057\u305f<\/li>\n<li aria-level=\"1\">CDN \u3084\u30d7\u30ed\u30ad\u30b7\u306e\u80cc\u5f8c\u306b\u30b5\u30fc\u30d3\u30b9\u3092\u79fb\u52d5\u3057\u305f\u304c\u8a3c\u660e\u66f8\u3092\u518d\u767a\u884c\u3057\u306a\u304b\u3063\u305f<\/li>\n<li aria-level=\"1\">SAN\uff08Subject Alternative Name\uff09\u306e\u8a2d\u5b9a\u30df\u30b9<\/li>\n<\/ul>\n<h3 id='\u4fe1\u983c\u3055\u308c\u3066\u3044\u306a\u3044\u8a3c\u660e\u66f8\u767a\u884c\u6a5f\u95a2-ca'  id=\"boomdevs_31\">\u4fe1\u983c\u3055\u308c\u3066\u3044\u306a\u3044\u8a3c\u660e\u66f8\u767a\u884c\u6a5f\u95a2\uff08CA\uff09<\/h3>\n<p>\u8a3c\u660e\u66f8\u767a\u884c\u6a5f\u95a2\uff08CA\uff09\u304c\u30d6\u30e9\u30a6\u30b6\u306b\u8a8d\u8b58\u307e\u305f\u306f\u4fe1\u983c\u3055\u308c\u3066\u3044\u306a\u3044\u5834\u5408\u3001\u30e6\u30fc\u30b6\u30fc\u306f\u300c\u8a3c\u660e\u66f8\u304c\u4fe1\u983c\u3055\u308c\u3066\u3044\u306a\u3044\u300d\u3068\u3044\u3046\u8b66\u544a\u3092\u76ee\u306b\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u81ea\u5df1\u7f72\u540d\u8a3c\u660e\u66f8\u3001\u5185\u90e8 CA \u306b\u3088\u308b\u767a\u884c\u3001\u307e\u305f\u306f\u671f\u9650\u5207\u308c\u30fb\u6b20\u843d\u3057\u305f\u4e2d\u9593\u8a3c\u660e\u66f8\u306b\u30c1\u30a7\u30fc\u30f3\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u306b\u8d77\u3053\u308a\u307e\u3059\u3002<\/p>\n<p><b>\u306a\u305c\u8d77\u3053\u308b\u306e\u304b\uff1a<\/b><\/p>\n<ul>\n<li aria-level=\"1\">\u672c\u756a\u74b0\u5883\u3067\u81ea\u5df1\u7f72\u540d\u8a3c\u660e\u66f8\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b<\/li>\n<li aria-level=\"1\">\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30c7\u30d0\u30a4\u30b9\u306b\u30d7\u30e9\u30a4\u30d9\u30fc\u30c8\u30eb\u30fc\u30c8\u8a3c\u660e\u66f8\u304c\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3055\u308c\u3066\u3044\u306a\u3044<\/li>\n<li aria-level=\"1\">\u4e2d\u9593\u8a3c\u660e\u66f8\u304c\u6b20\u843d\u307e\u305f\u306f\u7121\u52b9<\/li>\n<\/ul>\n<h3 id='\u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\u5931\u6557'  id=\"boomdevs_32\">\u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\u5931\u6557<\/h3>\n<p>TLS \u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\u5931\u6557\u306f\u3001\u30d6\u30e9\u30a6\u30b6\u3068\u30b5\u30fc\u30d0\u30fc\u304c\u5b89\u5168\u306b\u63a5\u7d9a\u3059\u308b\u65b9\u6cd5\u3067\u5408\u610f\u3067\u304d\u306a\u3044\u3068\u304d\u306b\u767a\u751f\u3057\u307e\u3059\u3002\u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\u306f\u53cc\u65b9\u304c\u540c\u3058\u6697\u53f7\u30d7\u30ed\u30c8\u30b3\u30eb\u3068\u30b9\u30a4\u30fc\u30c8\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/p>\n<p><b>\u306a\u305c\u8d77\u3053\u308b\u304b\uff1a<\/b><\/p>\n<ul>\n<li aria-level=\"1\">\u5ec3\u6b62\u3055\u308c\u305f\u307e\u305f\u306f\u30b5\u30dd\u30fc\u30c8\u3055\u308c\u3066\u3044\u306a\u3044\u6697\u53f7\u30b9\u30a4\u30fc\u30c8<\/li>\n<li aria-level=\"1\">\u53e4\u3044 TLS \u30d0\u30fc\u30b8\u30e7\u30f3\uff08\u4f8b\uff1a1.0 \u307e\u305f\u306f 1.1\uff09\u306e\u4f7f\u7528<\/li>\n<li aria-level=\"1\">\u8a3c\u660e\u66f8\u30c1\u30a7\u30fc\u30f3\u306e\u8a2d\u5b9a\u30df\u30b9\u3084\u4e2d\u9593\u8a3c\u660e\u66f8\u306e\u6b20\u843d<\/li>\n<\/ul>\n<div class=\"dcm_inblog_cta\">\n<p>TLS \u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\u3067\u4e8c\u5ea6\u3068\u30b5\u30a4\u30c8\u304c\u5931\u6557\u3057\u306a\u3044\u3088\u3046\u306b\u3057\u307e\u3057\u3087\u3046<\/p>\n<p style=\"font-size: 22px;\">Dotcom-Monitor \u306e <a href=\"https:\/\/www.dotcom-monitor.com\/ja\/%e3%83%a2%e3%83%8b%e3%82%bf%e3%83%aa%e3%83%b3%e3%82%b0%e8%a3%bd%e5%93%81\/ssl-certificate-monitoring\/\">TLS\/SSL Monitoring<\/a> \u3092\u4f7f\u3048\u3070\u3001\u8a3c\u660e\u66f8\u30a8\u30e9\u30fc\u3001\u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\u554f\u984c\u3001\u671f\u9650\u5207\u308c SSL \u3092\u81ea\u52d5\u691c\u51fa\u3057\u3001\u30e6\u30fc\u30b6\u30fc\u3084\u8a55\u5224\u306b\u5f71\u97ff\u304c\u51fa\u308b\u524d\u306b\u5bfe\u5fdc\u3067\u304d\u307e\u3059\u3002<\/p>\n<\/div>\n<h2 id='tls-\u3092\u76e3\u8996\u3059\u308b\u65b9\u6cd5'  id=\"boomdevs_33\">TLS \u3092\u76e3\u8996\u3059\u308b\u65b9\u6cd5<\/h2>\n<p>TLS\uff08Transport Layer Security\uff09\u76e3\u8996\u306f <b>\u30d7\u30ed\u30a2\u30af\u30c6\u30a3\u30d6\u3001 \u81ea\u52d5\u5316\u3001\u7d99\u7d9a\u7684<\/b> \u3067\u3042\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u8a3c\u660e\u66f8\u306f\u5f90\u3005\u306b\u58ca\u308c\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\uff1b\u3042\u308b\u65e5\u6b63\u5e38\u3067\u3001\u6b21\u306e\u65e5\u306b\u30a2\u30af\u30bb\u30b9\u3092\u30d6\u30ed\u30c3\u30af\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u3060\u304b\u3089\u3053\u305d\u52b9\u679c\u7684\u306a <b>TLS\/SSL \u76e3\u8996<\/b> \u306f\u30a6\u30a7\u30d6\u76e3\u8996\u6226\u7565\u306e\u91cd\u8981\u306a\u90e8\u5206\u3067\u3059\u3002<\/p>\n<p>\u4ee5\u4e0b\u306f\u8a3c\u660e\u66f8\u304c\u4e88\u671f\u305b\u306c\u30c0\u30a6\u30f3\u30bf\u30a4\u30e0\u3084\u4fe1\u983c\u554f\u984c\u3092\u5f15\u304d\u8d77\u3053\u3055\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u305f\u3081\u306e\u4e3b\u8981\u306a\u5b9f\u8df5\u4e8b\u9805\u3067\u3059\uff1a<\/p>\n<h3 id='\u8a3c\u660e\u66f8\u306e\u6709\u52b9\u6027\u3068\u671f\u9650\u3092\u8ffd\u8de1\u3059\u308b'  id=\"boomdevs_34\">\u8a3c\u660e\u66f8\u306e\u6709\u52b9\u6027\u3068\u671f\u9650\u3092\u8ffd\u8de1\u3059\u308b<\/h3>\n<p>\u8a3c\u660e\u66f8\u306f\u901a\u77e5\u306a\u3057\u306b\u671f\u9650\u5207\u308c\u306b\u306a\u308b\u3053\u3068\u304c\u3042\u308a\u3001\u305d\u306e\u969b\u30e6\u30fc\u30b6\u30fc\u306f\u5373\u5ea7\u306b\u30d6\u30e9\u30a6\u30b6\u30a8\u30e9\u30fc\u3092\u898b\u307e\u3059\u3002\u3053\u308c\u3092\u9632\u3050\u305f\u3081\u306b\u3001\u8a3c\u660e\u66f8\u306e\u671f\u9650\u3092\u7d99\u7d9a\u7684\u306b\u76e3\u8996\u3057\u3001\u671f\u9650\u524d\u306b\u9069\u5207\u306a\u30a2\u30e9\u30fc\u30c8\u3092\u8a2d\u5b9a\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u7406\u60f3\u7684\u306b\u306f <b>30 \u65e5\u30017 \u65e5\u30011 \u65e5<\/b> \u524d\u306b\u8b66\u544a\u3092\u51fa\u3057\u307e\u3059\u3002<\/p>\n<h3 id='\u5b8c\u5168\u306a\u8a3c\u660e\u66f8\u30c1\u30a7\u30fc\u30f3\u3092\u691c\u8a3c\u3059\u308b'  id=\"boomdevs_35\">\u5b8c\u5168\u306a\u8a3c\u660e\u66f8\u30c1\u30a7\u30fc\u30f3\u3092\u691c\u8a3c\u3059\u308b<\/h3>\n<p>\u6709\u52b9\u306a SSL \u8a3c\u660e\u66f8\u306f\u4fe1\u983c\u30c1\u30a7\u30fc\u30f3\u306e\u5b8c\u5168\u6027\u306b\u4f9d\u5b58\u3057\u307e\u3059\u3002\u8449\uff08\u30ea\u30fc\u30d5\uff09\u8a3c\u660e\u66f8\u304c\u6709\u52b9\u3067\u3082\u3001\u4e2d\u9593\u8a3c\u660e\u66f8\u304c\u6b20\u843d\u3057\u3066\u3044\u308c\u3070\u7279\u5b9a\u306e\u30d6\u30e9\u30a6\u30b6\u3084\u5730\u57df\u3067\u4fe1\u983c\u304c\u7834\u7dbb\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u8907\u6570\u306e\u30b0\u30ed\u30fc\u30d0\u30eb\u30ed\u30b1\u30fc\u30b7\u30e7\u30f3\u304b\u3089 <b>\u8a3c\u660e\u66f8\u30c1\u30a7\u30fc\u30f3\u5168\u4f53<\/b> \u3092\u5b9a\u671f\u7684\u306b\u691c\u8a3c\u3057\u3001\u5730\u57df\u7684\u306a\u4e0d\u4e00\u81f4\u3092\u65e9\u671f\u306b\u767a\u898b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h3 id='\u30d7\u30ed\u30c8\u30b3\u30eb\u3068\u6697\u53f7\u30b9\u30a4\u30fc\u30c8\u306e\u4e92\u63db\u6027\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b'  id=\"boomdevs_36\">\u30d7\u30ed\u30c8\u30b3\u30eb\u3068\u6697\u53f7\u30b9\u30a4\u30fc\u30c8\u306e\u4e92\u63db\u6027\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b<\/h3>\n<p>\u30d6\u30e9\u30a6\u30b6\u306f\u53e4\u3044\u30d7\u30ed\u30c8\u30b3\u30eb\uff08\u4f8b\uff1a<b>TLS 1.0<\/b>\u3001<b>1.1<\/b>\uff09\u3092\u6bb5\u968e\u7684\u306b\u5ec3\u6b62\u3057\u3001\u5f31\u3044\u6697\u53f7\u3092\u6392\u9664\u3057\u3066\u3044\u307e\u3059\u3002\u30b5\u30fc\u30d0\u30fc\u304c\u5ec3\u6b62\u3055\u308c\u305f\u8a2d\u5b9a\u306b\u4f9d\u5b58\u3057\u3066\u3044\u308b\u3068\u3001\u30e6\u30fc\u30b6\u30fc\u306f\u5b89\u5168\u306b\u63a5\u7d9a\u3067\u304d\u306a\u3044\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h3 id='\u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\u5931\u6557\u3068\u30ec\u30a4\u30c6\u30f3\u30b7\u3092\u76e3\u8996\u3059\u308b'  id=\"boomdevs_37\">\u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\u5931\u6557\u3068\u30ec\u30a4\u30c6\u30f3\u30b7\u3092\u76e3\u8996\u3059\u308b<\/h3>\n<p>TLS \u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\u306f\u6697\u53f7\u5316\u901a\u4fe1\u306e\u57fa\u790e\u3067\u3059\u3002\u3053\u308c\u304c\u5931\u6557\u3057\u305f\u308a\u9045\u304f\u306a\u3063\u305f\u308a\u3059\u308b\u3068\u30e6\u30fc\u30b6\u30fc\u306f\u9045\u5ef6\u3001\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u3001\u63a5\u7d9a\u30a8\u30e9\u30fc\u3092\u7d4c\u9a13\u3057\u307e\u3059\u3002<\/p>\n<p>\u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\u30a8\u30e9\u30fc\u306e\u30b9\u30d1\u30a4\u30af\u306f\u8ca0\u8377\u5206\u6563\u5668\u306e\u8aa4\u8a2d\u5b9a\u3001\u671f\u9650\u5207\u308c\u4e2d\u9593\u8a3c\u660e\u66f8\u3001\u307e\u305f\u306f\u6700\u8fd1\u306e CDN \u30ed\u30fc\u30eb\u30a2\u30a6\u30c8\u306b\u8d77\u56e0\u3059\u308b\u3053\u3068\u304c\u591a\u3044\u3067\u3059\u3002<\/p>\n<h3 id='\u8a3c\u660e\u66f8\u7ba1\u7406\u3092\u81ea\u52d5\u5316\u3059\u308b'  id=\"boomdevs_38\">\u8a3c\u660e\u66f8\u7ba1\u7406\u3092\u81ea\u52d5\u5316\u3059\u308b<\/h3>\n<p>\u8a3c\u660e\u66f8\u95a2\u9023\u306e\u969c\u5bb3\u3092\u9632\u3050\u6700\u826f\u306e\u65b9\u6cd5\u306f\u81ea\u52d5\u5316\u3067\u3059\u3002\u8a3c\u660e\u66f8\u3092\u30b3\u30fc\u30c9\u306e\u3088\u3046\u306b\u6271\u3044\u3001\u66f4\u65b0\u3092\u81ea\u52d5\u5316\u3057\u3001\u74b0\u5883\u9593\u3067\u4e00\u8cab\u3057\u3066\u5c55\u958b\u3057\u3001\u30c7\u30a3\u30b9\u30af\u5bb9\u91cf\u3084 CPU \u3068\u540c\u3058\u7a4d\u6975\u6027\u3067\u671f\u9650\u3092\u76e3\u8996\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h2 id='http-\u30a8\u30e9\u30fc'  id=\"boomdevs_39\">HTTP \u30a8\u30e9\u30fc<\/h2>\n<p>DNS\u3001TCP\u3001TLS \u304c\u305d\u308c\u305e\u308c\u306e\u5f79\u5272\u3092\u6b63\u5e38\u306b\u5b8c\u4e86\u3057\u305f\u5f8c\u3001\u30d6\u30e9\u30a6\u30b6\u306f\u6700\u7d42\u7684\u306b Web \u30b5\u30fc\u30d0\u30fc\u3078 <b>HTTP \u30ea\u30af\u30a8\u30b9\u30c8<\/b> \u3092\u9001\u4fe1\u3057\u307e\u3059\u3002\u30b5\u30fc\u30d0\u30fc\u306f\u3001\u3059\u3079\u3066\u304c\u6b63\u5e38\u306b\u52d5\u4f5c\u3057\u3066\u3044\u308b\u5834\u5408\u306f <b><a href=\"https:\/\/www.dotcom-monitor.com\/blog\/ja\/10-%e6%9c%80%e3%82%82%e4%b8%80%e8%88%ac%e7%9a%84%e3%81%aa-http-%e3%82%b9%e3%83%86%e3%83%bc%e3%82%bf%e3%82%b9-%e3%82%b3%e3%83%bc%e3%83%89\/\">HTTP \u30b9\u30c6\u30fc\u30bf\u30b9\u30b3\u30fc\u30c9<\/a><\/b> 200 OK \u3092\u8fd4\u3057\u3001\u554f\u984c\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u306f\u30a8\u30e9\u30fc\u30b3\u30fc\u30c9\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u3089\u306e HTTP \u5fdc\u7b54\u3092\u76e3\u8996\u3059\u308b\u3053\u3068\u306f\u3001\u591a\u304f\u306e\u4eba\u304c <b>\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u7a3c\u50cd\u76e3\u8996<\/b> \u3068\u805e\u3044\u3066\u6700\u521d\u306b\u60f3\u50cf\u3059\u308b\u3053\u3068\u3067\u3059\u3002\u3057\u304b\u3057\u3001\u3053\u308c\u3089\u306e HTTP \u5fdc\u7b54\u3060\u3051\u3092\u76e3\u8996\u3059\u308b\u3053\u3068\u306f\u30a6\u30a7\u30d6\u76e3\u8996\u306e\u4e00\u5074\u9762\u306b\u904e\u304e\u307e\u305b\u3093\u3002DNS\u3001TCP\u3001TLS \u3068\u3044\u3063\u305f\u524d\u6bb5\u306e\u30ec\u30a4\u30e4\u30fc\u304b\u3089\u306e\u6587\u8108\u304c\u306a\u3051\u308c\u3070\u3001HTTP \u76e3\u8996\u306f <b>\u4f55\u304c\u5931\u6557\u3057\u305f\u304b<\/b> \u3092\u793a\u3059\u3053\u3068\u306f\u3067\u304d\u307e\u3059\u304c\u3001<b>\u306a\u305c<\/b> \u305d\u3046\u306a\u3063\u305f\u304b\u3092\u8aac\u660e\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u3060\u304b\u3089\u3053\u305d\u9ad8\u5ea6\u306a <b>Web \u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u76e3\u8996<\/b> \u306f\u53ef\u7528\u6027\u3092\u8d85\u3048\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3001\u5fdc\u7b54\u30b3\u30fc\u30c9\u3001\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u306e\u6574\u5408\u6027\u3082\u898b\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h3 id='\u4e00\u822c\u7684\u306a-http-\u30a8\u30e9\u30fc'  id=\"boomdevs_40\">\u4e00\u822c\u7684\u306a HTTP \u30a8\u30e9\u30fc<\/h3>\n<p>\u3053\u3053\u3067\u306f\u3001\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306e\u7a3c\u50cd\u6027\u3068\u30e6\u30fc\u30b6\u30fc\u4f53\u9a13\u306b\u5f71\u97ff\u3059\u308b\u6700\u3082\u983b\u7e41\u306a HTTP \u554f\u984c\u3092\u7d39\u4ecb\u3057\u307e\u3059\uff1a<\/p>\n<ul>\n<li aria-level=\"1\"><b>404 Not Found:<\/b> \u30ea\u30af\u30a8\u30b9\u30c8\u3055\u308c\u305f\u30da\u30fc\u30b8\u3084\u30ea\u30bd\u30fc\u30b9\u304c\u5b58\u5728\u3057\u306a\u3044\u3002\u58ca\u308c\u305f\u30ea\u30f3\u30af\u3001\u524a\u9664\u3055\u308c\u305f\u30da\u30fc\u30b8\u3001\u307e\u305f\u306f\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u306e\u8a2d\u5b9a\u30df\u30b9\u304c\u539f\u56e0\u3067\u3042\u308b\u3053\u3068\u304c\u591a\u3044\u3002<\/li>\n<li aria-level=\"1\"><b>500 Internal Server Error:<\/b> \u30b5\u30fc\u30d0\u30fc\u304c\u4e88\u671f\u3057\u306a\u3044\u6761\u4ef6\u306b\u906d\u9047\u3057\u305f\u3002\u591a\u304f\u306e\u5834\u5408\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u30d0\u30b0\u3001\u8a2d\u5b9a\u30df\u30b9\u3001\u307e\u305f\u306f\u904e\u8ca0\u8377\u30d7\u30ed\u30bb\u30b9\u304c\u539f\u56e0\u3002<\/li>\n<li aria-level=\"1\"><b>502 Bad Gateway:<\/b> \u30d7\u30ed\u30ad\u30b7\u3084\u30ed\u30fc\u30c9\u30d0\u30e9\u30f3\u30b5\u30fc\u304c\u4e0a\u6d41\u30b5\u30fc\u30d0\u30fc\u304b\u3089\u7121\u52b9\u306a\u5fdc\u7b54\u3092\u53d7\u3051\u53d6\u3063\u305f\u3002\u5206\u6563\u578b\u3084\u30de\u30a4\u30af\u30ed\u30b5\u30fc\u30d3\u30b9\u74b0\u5883\u3067\u4e00\u822c\u7684\u3002<\/li>\n<li aria-level=\"1\"><b>503 Service Unavailable:<\/b> \u30b5\u30fc\u30d0\u30fc\u304c\u4e00\u6642\u7684\u306b\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u51e6\u7406\u3067\u304d\u306a\u3044\u3002\u901a\u5e38\u306f\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u3084\u5bb9\u91cf\u5236\u9650\u304c\u539f\u56e0\u3002<\/li>\n<li aria-level=\"1\"><b>504 Gateway Timeout:<\/b> \u4e0a\u6d41\u30b5\u30fc\u30d3\u30b9\u306e\u5fdc\u7b54\u304c\u9045\u304f\u3001\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u304c\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u3057\u305f\u3002\u30ec\u30a4\u30c6\u30f3\u30b7\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u3001\u307e\u305f\u306f\u4f9d\u5b58\u95a2\u4fc2\u306e\u9045\u5ef6\u3092\u793a\u3059\u3053\u3068\u304c\u3042\u308b\u3002<\/li>\n<\/ul>\n<p>\u3053\u308c\u3089\u306e\u30a8\u30e9\u30fc\u306f\u30e6\u30fc\u30b6\u30fc\u306e\u4fe1\u983c\u3084\u30b3\u30f3\u30d0\u30fc\u30b8\u30e7\u30f3\u306b\u5f71\u97ff\u3057\u3001\u591a\u304f\u306e\u5834\u5408\u3001\u9867\u5ba2\u306f\u539f\u56e0\u3092\u77e5\u3089\u305a\u306b\u96e2\u8131\u3057\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/p>\n<h3 id='http-\u3092\u76e3\u8996\u3059\u308b\u65b9\u6cd5'  id=\"boomdevs_41\">HTTP \u3092\u76e3\u8996\u3059\u308b\u65b9\u6cd5<\/h3>\n<p>\u52b9\u679c\u7684\u306a <b>HTTP \u76e3\u8996<\/b> \u306f\u30db\u30fc\u30e0\u30da\u30fc\u30b8\u304c\u8aad\u307f\u8fbc\u3081\u308b\u304b\u78ba\u8a8d\u3059\u308b\u4ee5\u4e0a\u306e\u3053\u3068\u3092\u884c\u3044\u307e\u3059\u3002\u5fdc\u7b54\u30b3\u30fc\u30c9\u3001\u5fdc\u7b54\u6642\u9593\u3001\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u6210\u529f\u7387\u3092\u691c\u8a3c\u3057\u3001\u30a6\u30a7\u30d6\u4f53\u9a13\u306e\u3059\u3079\u3066\u306e\u5c64\u3092\u30ab\u30d0\u30fc\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u4e3b\u8981\u306a\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u306f\u6b21\u306e\u901a\u308a\u3067\u3059\uff1a<\/p>\n<ul>\n<li aria-level=\"1\"><b>\u5408\u6210\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3:<\/b> \u30ed\u30b0\u30a4\u30f3\u3001\u30ab\u30fc\u30c8\u3078\u306e\u8ffd\u52a0\u3001\u30c1\u30a7\u30c3\u30af\u30a2\u30a6\u30c8\u5b8c\u4e86\u306a\u3069\u306e\u5b9f\u969b\u306e\u30e6\u30fc\u30b6\u30fc\u64cd\u4f5c\u3092\u30b7\u30df\u30e5\u30ec\u30fc\u30c8\u3057\u3001\u30d5\u30eb\u30ef\u30fc\u30af\u30d5\u30ed\u30fc\u304c\u6a5f\u80fd\u3059\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/li>\n<li aria-level=\"1\"><b>\u5fdc\u7b54\u30b3\u30fc\u30c9\u8ffd\u8de1:<\/b> 200\u2013299 \u7bc4\u56f2\u5916\u306e\u5fdc\u7b54\u3092\u81ea\u52d5\u3067\u30ad\u30e3\u30d7\u30c1\u30e3\u3057\u3066\u30a2\u30e9\u30fc\u30c8\u3092\u4e0a\u3052\u3001\u30b5\u30fc\u30d0\u30fc\u30b5\u30a4\u30c9\u3084\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30ec\u30d9\u30eb\u306e\u969c\u5bb3\u3092\u8fc5\u901f\u306b\u691c\u51fa\u3057\u307e\u3059\u3002<\/li>\n<li aria-level=\"1\"><b>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u95be\u5024:<\/b> \u30b0\u30ed\u30fc\u30d0\u30eb\u306b\u5fdc\u7b54\u6642\u9593\u3068\u30da\u30fc\u30b8\u8aad\u307f\u8fbc\u307f\u901f\u5ea6\u3092\u76e3\u8996\u3057\u307e\u3059\u3002\u30b5\u30a4\u30c8\u304c\u300c\u7a3c\u50cd\u4e2d\u300d\u3067\u3082\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u9045\u3051\u308c\u3070\u30e6\u30fc\u30b6\u30fc\u306f\u96e2\u308c\u307e\u3059\u3002<\/li>\n<li aria-level=\"1\"><b>\u30b0\u30ed\u30fc\u30d0\u30eb\u76e3\u8996\u30ed\u30b1\u30fc\u30b7\u30e7\u30f3:<\/b> \u8907\u6570\u306e\u5730\u7406\u7684\u30ea\u30fc\u30b8\u30e7\u30f3\u304b\u3089 HTTP \u30c1\u30a7\u30c3\u30af\u3092\u5b9f\u884c\u3057\u3001\u30ec\u30a4\u30c6\u30f3\u30b7\u3001CDN \u554f\u984c\u3001\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u306e\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u3092\u7279\u5b9a\u3057\u307e\u3059\u3002<\/li>\n<\/ul>\n<h3 id='http-\u76e3\u8996\u304c\u91cd\u8981\u306a\u7406\u7531'  id=\"boomdevs_42\">HTTP \u76e3\u8996\u304c\u91cd\u8981\u306a\u7406\u7531<\/h3>\n<p>HTTP \u3092\u76e3\u8996\u3059\u308b\u3053\u3068\u306f\u5358\u306b\u7a3c\u50cd\u78ba\u8a8d\u3092\u3059\u308b\u3060\u3051\u3067\u306f\u306a\u304f\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u5065\u5168\u6027\u3068\u30e6\u30fc\u30b6\u30fc\u4f53\u9a13\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u3067\u3059\u3002\u5fdc\u7b54\u304c\u9045\u3044\u3001\u307e\u305f\u306f\u4e00\u8cab\u6027\u304c\u306a\u3044\u30b5\u30a4\u30c8\u306f\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u3001\u30b3\u30f3\u30d0\u30fc\u30b8\u30e7\u30f3\u3001SEO \u30e9\u30f3\u30ad\u30f3\u30b0\u3092\u5931\u3044\u307e\u3059\u3002HTTP \u76e3\u8996\u3092 DNS\u3001TCP\u3001TLS \u306e\u30c1\u30a7\u30c3\u30af\u3068\u91cd\u306d\u308b\u3053\u3068\u3067\u3001\u554f\u984c\u306e\u767a\u751f\u6e90\u3092\u30b3\u30fc\u30c9\u3001\u30a4\u30f3\u30d5\u30e9\u3001\u307e\u305f\u306f\u4e0a\u6d41\u306e\u4f9d\u5b58\u95a2\u4fc2\u306e\u3044\u305a\u308c\u304b\u306b\u7d5e\u308a\u8fbc\u3080\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3 id='\u4e00\u822c\u7684\u306a-http-\u30a8\u30e9\u30fc-1'  id=\"boomdevs_43\">\u4e00\u822c\u7684\u306a HTTP \u30a8\u30e9\u30fc<\/h3>\n<p>\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306e\u7a3c\u50cd\u6027\u3068\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u76e3\u8996\u3059\u308b\u969b\u3001HTTP \u5fdc\u7b54\u30b3\u30fc\u30c9\u306f\u5404\u30e6\u30fc\u30b6\u30fc\u30ea\u30af\u30a8\u30b9\u30c8\u306e\u7d50\u679c\u3092\u793a\u3057\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u4e00\u822c\u7684\u306a HTTP \u30a8\u30e9\u30fc\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u3067\u3001\u554f\u984c\u304c <b>\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3<\/b>\u3001<b>\u30b5\u30fc\u30d0\u30fc<\/b>\u3001\u3042\u308b\u3044\u306f <b>\u4e0a\u6d41\u4f9d\u5b58<\/b> \u306e\u3069\u3053\u306b\u3042\u308b\u304b\u3092\u7279\u5b9a\u3057\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n<ul>\n<li aria-level=\"1\"><b>404 Not Found:<\/b> \u30ea\u30af\u30a8\u30b9\u30c8\u3057\u305f\u30ea\u30bd\u30fc\u30b9\u3084\u30da\u30fc\u30b8\u304c\u5b58\u5728\u3057\u306a\u3044\u3053\u3068\u3092\u793a\u3057\u307e\u3059\u3002\u901a\u5e38\u3001<b>\u65ad\u30ea\u30f3\u30af<\/b>\u3001<b>\u30b3\u30f3\u30c6\u30f3\u30c4\u524a\u9664<\/b>\u3001\u307e\u305f\u306f <b>URL \u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u306e\u8aa4\u308a<\/b> \u304c\u539f\u56e0\u3067\u3059\u3002\u5b9a\u671f\u7684\u306a <b>HTTP \u76e3\u8996<\/b> \u306b\u3088\u308a\u3001\u3053\u308c\u3089\u306e\u30a8\u30e9\u30fc\u3092\u65e9\u671f\u306b\u691c\u51fa\u3057 SEO \u3068\u30e6\u30fc\u30b6\u30fc\u4fe1\u983c\u3092\u5b88\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/li>\n<li aria-level=\"1\"><b>500 Internal Server Error:<\/b> \u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u30d0\u30b0\u3001\u30b5\u30fc\u30d0\u30fc\u8a2d\u5b9a\u30df\u30b9\u3001\u307e\u305f\u306f\u30d0\u30c3\u30af\u30a8\u30f3\u30c9\u30d7\u30ed\u30bb\u30b9\u306e\u904e\u8ca0\u8377\u306b\u3088\u308a\u767a\u751f\u3059\u308b\u4e00\u822c\u7684\u306a\u30b5\u30fc\u30d0\u30fc\u5074\u306e\u5931\u6557\u3067\u3059\u3002HTTP \u5fdc\u7b54\u30ed\u30b0\u3092\u76e3\u8996\u3059\u308b\u3053\u3068\u3067\u3001\u30e6\u30fc\u30b6\u30fc\u306b\u5f71\u97ff\u304c\u51fa\u308b\u524d\u306b\u7e70\u308a\u8fd4\u3057\u767a\u751f\u3059\u308b 500 \u30a8\u30e9\u30fc\u3092\u8fc5\u901f\u306b\u7279\u5b9a\u3067\u304d\u307e\u3059\u3002<\/li>\n<li aria-level=\"1\"><b>502 Bad Gateway:<\/b> <b>\u30d7\u30ed\u30ad\u30b7\u3001CDN\u3001\u307e\u305f\u306f\u30ed\u30fc\u30c9\u30d0\u30e9\u30f3\u30b5\u30fc<\/b> \u304c\u4e0a\u6d41\u30b5\u30fc\u30d0\u30fc\u304b\u3089\u306e\u7121\u52b9\u306a\u5fdc\u7b54\u3092\u53d7\u3051\u53d6\u3063\u305f\u3068\u304d\u306b\u767a\u751f\u3057\u307e\u3059\u3002\u5206\u6563\u578b\u3084\u30de\u30a4\u30af\u30ed\u30b5\u30fc\u30d3\u30b9\u74b0\u5883\u3067\u3001\u3042\u308b\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304c\u5225\u306e\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3068\u6b63\u3057\u304f\u901a\u4fe1\u3067\u304d\u306a\u3044\u5834\u5408\u306b\u4e00\u822c\u7684\u3067\u3059\u3002<\/li>\n<li aria-level=\"1\"><b>503 Service Unavailable:<\/b> \u30b5\u30fc\u30d0\u30fc\u304c\u4e00\u6642\u7684\u306b\u30ea\u30af\u30a8\u30b9\u30c8\u3092\u51e6\u7406\u3067\u304d\u306a\u3044\u3053\u3068\u3092\u793a\u3057\u3001\u901a\u5e38\u306f <b>\u8a08\u753b\u3055\u308c\u305f\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9<\/b>\u3001<b>\u30ea\u30bd\u30fc\u30b9\u4e0d\u8db3<\/b>\u3001\u307e\u305f\u306f <b>\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u30b9\u30d1\u30a4\u30af<\/b> \u306b\u8d77\u56e0\u3057\u307e\u3059\u3002\u30d7\u30ed\u30a2\u30af\u30c6\u30a3\u30d6\u306a\u76e3\u8996\u306b\u3088\u308a\u3001\u969c\u5bb3\u306e\u62e1\u5927\u524d\u306b\u904e\u8ca0\u8377\u72b6\u614b\u3092\u7279\u5b9a\u3057\u3066\u7de9\u548c\u3067\u304d\u307e\u3059\u3002<\/li>\n<li aria-level=\"1\"><b>504 Gateway Timeout:<\/b> \u4e0a\u6d41\u30b5\u30fc\u30d0\u30fc\u306e\u5fdc\u7b54\u304c\u9045\u304f\u30b2\u30fc\u30c8\u30a6\u30a7\u30a4\u3084\u30d7\u30ed\u30ad\u30b7\u304c\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u3057\u305f\u3068\u304d\u306b\u767a\u751f\u3057\u307e\u3059\u3002\u3053\u308c\u306f <b>\u30ec\u30a4\u30c6\u30f3\u30b7<\/b>\u3001<b>\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306e\u30dc\u30c8\u30eb\u30cd\u30c3\u30af<\/b>\u3001\u307e\u305f\u306f\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30b9\u30bf\u30c3\u30af\u5185\u306e\u4f9d\u5b58\u95a2\u4fc2\u306e\u9045\u5ef6\u3092\u793a\u3059\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<\/ul>\n<h2 id='\u307e\u3068\u3081-\u5206\u5c64\u5316\u3055\u308c\u305f\u30a8\u30e9\u30fc\u76e3\u8996\u6226\u7565'  id=\"boomdevs_44\">\u307e\u3068\u3081\uff1a\u5206\u5c64\u5316\u3055\u308c\u305f\u30a8\u30e9\u30fc\u76e3\u8996\u6226\u7565<\/h2>\n<p>\u73fe\u4ee3\u306e <b>\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u76e3\u8996<\/b> \u306f\u5358\u306a\u308b\u30c0\u30a6\u30f3\u691c\u77e5\u3067\u306f\u306a\u304f\u3001\u30b5\u30a4\u30c8\u304c\u306a\u305c\u30c0\u30a6\u30f3\u3057\u305f\u306e\u304b\u3001\u3069\u306e\u30ec\u30a4\u30e4\u30fc\u304c\u539f\u56e0\u304b\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u306b\u3042\u308a\u307e\u3059\u3002\u63a5\u7d9a\u30b7\u30fc\u30b1\u30f3\u30b9\u306e\u5404\u30b9\u30c6\u30c3\u30d7\u2014\u2014DNS\u3001<b>TCP\u3001TLS<\/b>\u3001\u304a\u3088\u3073 <b>HTTP<\/b>\u2014\u2014\u306f\u305d\u308c\u305e\u308c\u7570\u306a\u308b\u5f79\u5272\u3092\u679c\u305f\u3057\u3001\u72ec\u7acb\u3057\u3066\u969c\u5bb3\u3092\u8d77\u3053\u3059\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u3059\u3079\u3066\u306e\u969c\u5bb3\u306f\u9806\u5e8f\u7acb\u3063\u3066\u767a\u751f\u3057\u307e\u3059\uff1a<\/p>\n<ul>\n<li aria-level=\"1\">\u3082\u3057 <b>DNS \u304c\u5931\u6557<\/b> \u3059\u308c\u3070\u3001\u63a5\u7d9a\u306f\u6210\u7acb\u3057\u307e\u305b\u3093\u3002<\/li>\n<li aria-level=\"1\">\u3082\u3057 <b>TCP \u304c\u5931\u6557<\/b> \u3059\u308c\u3070\u3001DNS \u89e3\u6c7a\u306f\u6210\u529f\u3057\u3066\u3044\u308b\u304c\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\u304c\u5b8c\u4e86\u3057\u3066\u3044\u307e\u305b\u3093\u3002<\/li>\n<li aria-level=\"1\">\u3082\u3057 <b>TLS \u304c\u5931\u6557<\/b> \u3059\u308c\u3070\u3001\u6697\u53f7\u5316\u8a2d\u5b9a\u3084\u8a3c\u660e\u66f8\u691c\u8a3c\u304c\u58ca\u308c\u3066\u3044\u307e\u3059\u3002<\/li>\n<li aria-level=\"1\">\u3082\u3057 <b>HTTP \u304c\u5931\u6557<\/b> \u3059\u308c\u3070\u3001\u524d\u6bb5\u306e\u3059\u3079\u3066\u304c\u6210\u529f\u3057\u3066\u304a\u308a\u3001\u554f\u984c\u306f\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3084\u30b5\u30fc\u30d0\u30fc\u5074\u306b\u3042\u308a\u307e\u3059\u3002<\/li>\n<\/ul>\n<p>\u3053\u306e\u5206\u5c64\u30a2\u30d7\u30ed\u30fc\u30c1\u306f\u3001Web \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u53ef\u7528\u6027\u306e\u554f\u984c\u3092\u8a3a\u65ad\u3059\u308b\u969b\u306b <b>\u660e\u78ba\u3055\u3068\u7cbe\u5ea6<\/b> \u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002<\/p>\n<p><b>\u5305\u62ec\u7684\u306a\u30a8\u30e9\u30fc\u76e3\u8996\u306e\u56db\u3064\u306e\u5c64<\/b><\/p>\n<ol>\n<li aria-level=\"1\"><b>DNS \u30c1\u30a7\u30c3\u30af\u304b\u3089\u59cb\u3081\u308b\uff1a<\/b>\u30c9\u30e1\u30a4\u30f3\u304c\u8907\u6570\u306e\u30b0\u30ed\u30fc\u30d0\u30eb\u30ed\u30b1\u30fc\u30b7\u30e7\u30f3\u304b\u3089\u6b63\u3057\u304f\u89e3\u6c7a\u3055\u308c\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/li>\n<li aria-level=\"1\"><b>TCP \u63a5\u7d9a\u76e3\u8996\u3092\u8ffd\u52a0\u3059\u308b\uff1a<\/b>\u30b5\u30fc\u30d0\u30fc\u304c\u63a5\u7d9a\u8981\u6c42\u3092\u53d7\u3051\u5165\u308c\u5fdc\u7b54\u3057\u3066\u3044\u308b\u3053\u3068\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002<\/li>\n<li aria-level=\"1\"><b>TLS \u8a3c\u660e\u66f8\u76e3\u8996\u3092\u5c0e\u5165\u3059\u308b\uff1a<\/b>SSL \u8a3c\u660e\u66f8\u306e\u6709\u52b9\u6027\u3001\u30cf\u30f3\u30c9\u30b7\u30a7\u30a4\u30af\u6027\u80fd\u3001\u30c1\u30a7\u30fc\u30f3\u4fe1\u983c\u3092\u8ffd\u8de1\u3057\u307e\u3059\u3002<\/li>\n<li aria-level=\"1\"><b>HTTP \u5fdc\u7b54\u76e3\u8996\u3067\u7de0\u3081\u304f\u304f\u308b\uff1a<\/b>\u5b9f\u969b\u306e\u7a3c\u50cd\u6027\u3001\u30ec\u30a4\u30c6\u30f3\u30b7\u3001\u5fdc\u7b54\u30b3\u30fc\u30c9\u3092\u6e2c\u5b9a\u3057\u307e\u3059\u3002<\/li>\n<\/ol>\n<h3 id='\u3088\u308a\u901f\u3044\u6839\u672c\u539f\u56e0\u5206\u6790'  id=\"boomdevs_45\">\u3088\u308a\u901f\u3044\u6839\u672c\u539f\u56e0\u5206\u6790<\/h3>\n<p>\u3053\u308c\u3089\u306e\u5c64\u306b\u6cbf\u3063\u3066\u76e3\u8996\u3092\u6574\u3048\u308b\u3053\u3068\u3067\u3001\u30c1\u30fc\u30e0\u306f\u6b63\u78ba\u306a\u6545\u969c\u7b87\u6240\u3068\u4fee\u6b63\u306e\u62c5\u5f53\u8005\u3092\u8fc5\u901f\u306b\u7279\u5b9a\u3067\u304d\u307e\u3059\uff1a<\/p>\n<ul>\n<li aria-level=\"1\"><b>DNS \u30a8\u30e9\u30fc\uff1f<\/b> DNS \u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u30d7\u30ed\u30d0\u30a4\u30c0\u306b\u9023\u7d61\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<li aria-level=\"1\"><b>TCP \u30a8\u30e9\u30fc\uff1f<\/b> \u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u307e\u305f\u306f\u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u30d7\u30ed\u30d0\u30a4\u30c0\u3078\u30a8\u30b9\u30ab\u30ec\u30fc\u30b7\u30e7\u30f3\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<li aria-level=\"1\"><b>TLS \u30a8\u30e9\u30fc\uff1f<\/b> \u8a3c\u660e\u66f8\u306e\u6709\u52b9\u6027\u3084\u30a8\u30c3\u30b8\u8a2d\u5b9a\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<li aria-level=\"1\"><b>HTTP \u30a8\u30e9\u30fc\uff1f<\/b> \u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u307e\u305f\u306f DevOps \u30c1\u30fc\u30e0\u306b\u901a\u77e5\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/li>\n<\/ul>\n<p>\u6f20\u7136\u3068\u3057\u305f <i>\u300c\u30b5\u30a4\u30c8\u304c\u30c0\u30a6\u30f3\u300d<\/i> \u306e\u8b66\u544a\u3067\u306f\u306a\u304f\u3001\u5b9f\u884c\u53ef\u80fd\u306a\u6d1e\u5bdf\u3092\u5f97\u308b\u3053\u3068\u3067 MTTR \u3092\u77ed\u7e2e\u3057\u3001\u30c1\u30fc\u30e0\u9593\u306e\u63a8\u6e2c\u3092\u6392\u9664\u3067\u304d\u307e\u3059\u3002<\/p>\n<h2 id='\u7d50\u8ad6'  id=\"boomdevs_46\">\u7d50\u8ad6<\/h2>\n<p>\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306f\u5358\u4e00\u306e\u65b9\u6cd5\u3067\u6545\u969c\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001<i>\u5c64\u3054\u3068\u306b<\/i> \u6545\u969c\u3057\u307e\u3059\u3002\u3059\u3079\u3066\u306e\u969c\u5bb3\u306f\u63a5\u7d9a\u30c1\u30a7\u30fc\u30f3\u306e\u7279\u5b9a\u306e\u30dd\u30a4\u30f3\u30c8\uff08<b>DNS\u3001TCP\u3001TLS\u3001\u307e\u305f\u306f HTTP<\/b>\uff09\u304b\u3089\u59cb\u307e\u308a\u3001\u305d\u308c\u305e\u308c\u56fa\u6709\u306e\u30ea\u30b9\u30af\u3001\u6319\u52d5\u3001\u6545\u969c\u30b7\u30b0\u30cd\u30c1\u30e3\u3092\u6301\u3061\u307e\u3059\u3002<\/p>\n<p><b>\u30a8\u30e9\u30fc\u7a2e\u985e\u5225\u306e\u76e3\u8996<\/b> \u3092\u63a1\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u8907\u96d1\u3055\u3092\u660e\u78ba\u3055\u306b\u5909\u3048\u3001\u4e00\u822c\u7684\u306a <i>\u300c\u30b5\u30a4\u30c8\u304c\u30c0\u30a6\u30f3\u300d<\/i> \u306e\u30a2\u30e9\u30fc\u30c8\u3092\u7cbe\u5bc6\u3067\u5b9f\u884c\u53ef\u80fd\u306a\u6d1e\u5bdf\u306b\u5909\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>Dotcom-Monitor \u306e\u3088\u3046\u306a\u30c4\u30fc\u30eb\u3067\u5f37\u5316\u3055\u308c\u305f\u5805\u7262\u306a <b>\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u76e3\u8996\u6226\u7565<\/b> \u306b\u3088\u308a\u3001\u3042\u306a\u305f\u306f\u5358\u306a\u308b\u7a3c\u50cd\u30c7\u30fc\u30bf\u4ee5\u4e0a\u306e\u3082\u306e\u3092\u5f97\u307e\u3059\u3002<i>\u306a\u305c<\/i> \u30b5\u30a4\u30c8\u304c\u30c0\u30a6\u30f3\u3057\u305f\u306e\u304b\u3001<i>\u3069\u306e\u5c64<\/i> \u304c\u539f\u56e0\u304b\u3001\u305d\u3057\u3066 <i>\u8ab0\u304c<\/i> \u4fee\u6b63\u3059\u3079\u304d\u304b\u3092\u77e5\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u30ec\u30b8\u30b9\u30c8\u30e9\u5074\u306e DNS \u64cd\u4f5c\u304c\u5fc5\u8981\u306a\u5834\u5408\u3067\u3082\u3001\u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u30d7\u30ed\u30d0\u30a4\u30c0\u306b\u3088\u308b TCP \u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u3067\u3042\u3063\u3066\u3082\u3001\u3042\u308b\u3044\u306f TLS \u8a3c\u660e\u66f8\u306e\u671f\u9650\u5207\u308c\u3067\u3042\u3063\u3066\u3082\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u6c17\u4ed8\u304f\u524d\u306b\u6839\u672c\u539f\u56e0\u3092\u8fc5\u901f\u306b\u7279\u5b9a\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u6700\u7d42\u7684\u306b\u3001\u30a8\u30e9\u30fc\u306b\u57fa\u3065\u304f\u76e3\u8996\u306f\u5358\u306b\u30b5\u30a4\u30c8\u3092\u7a3c\u50cd\u3055\u305b\u7d9a\u3051\u308b\u3053\u3068\u3067\u306f\u306a\u304f\u3001<b>\u8cac\u4efb\u3001\u53ef\u8996\u6027\u3001\u901f\u5ea6<\/b> \u306b\u95a2\u3059\u308b\u3082\u306e\u3067\u3059\u3002\u6b21\u306b\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u306b\u554f\u984c\u304c\u751f\u3058\u305f\u3068\u304d\u306f\u3001\u4e0d\u78ba\u5b9f\u3055\u3067\u59a5\u5354\u3057\u306a\u3044\u3067\u304f\u3060\u3055\u3044\u3002\u4f55\u304c\u58ca\u308c\u305f\u306e\u304b\u3001\u306a\u305c\u58ca\u308c\u305f\u306e\u304b\u3001\u305d\u3057\u3066\u3069\u306e\u3088\u3046\u306b\u81ea\u4fe1\u3092\u6301\u3063\u3066\u305d\u308c\u3092\u89e3\u6c7a\u3059\u308b\u304b\u3092\u6b63\u78ba\u306b\u628a\u63e1\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<div class=\"dcm_inblog_cta\">\n<p>\u30b9\u30de\u30fc\u30c8\u306b\u30b5\u30a4\u30c8\u3092\u76e3\u8996\u3059\u308b\u6e96\u5099\u306f\u3067\u304d\u3066\u3044\u307e\u3059\u304b\uff1f<\/p>\n<p style=\"font-size: 22px;\">\u30e6\u30fc\u30b6\u30fc\u304c\u6c17\u3065\u304f\u524d\u306b DNS\u3001TCP\u3001TLS\u3001HTTP \u306e\u554f\u984c\u3092\u691c\u51fa\u3057\u307e\u3059\u3002<\/p>\n<p><a class=\"dcm_inblog_cta_button\" href=\"https:\/\/userauth.dotcom-monitor.com\/Account\/FreeTrialSignUp?SolutionType=Monitoring\">\u4eca\u3059\u3050 Dotcom-Monitor \u306e\u7121\u6599\u30c8\u30e9\u30a4\u30a2\u30eb\u3092\u958b\u59cb<\/a><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u30a8\u30e9\u30fc\u306e\u7a2e\u985e\u3054\u3068\u306b\u30a6\u30a7\u30d6\u30b5\u30a4\u30c8\u3092\u76e3\u8996\u3059\u308b\u65b9\u6cd5\u3092\u5b66\u3073\u307e\u3059\u3002DNS \u304b\u3089 TCP\u3001TLS\u3001HTTP \u307e\u3067\u3001\u5404\u969c\u5bb3\u306e\u610f\u5473\u3068\u76e3\u8996\u304c\u3069\u306e\u3088\u3046\u306b\u6839\u672c\u539f\u56e0\u3092\u660e\u3089\u304b\u306b\u3059\u308b\u304b\u3092\u78ba\u8a8d\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n","protected":false},"author":39,"featured_media":30434,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6035],"tags":[],"class_list":["post-30426","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-6035"],"_links":{"self":[{"href":"https:\/\/www.dotcom-monitor.com\/blog\/ja\/wp-json\/wp\/v2\/posts\/30426","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.dotcom-monitor.com\/blog\/ja\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.dotcom-monitor.com\/blog\/ja\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.dotcom-monitor.com\/blog\/ja\/wp-json\/wp\/v2\/users\/39"}],"replies":[{"embeddable":true,"href":"https:\/\/www.dotcom-monitor.com\/blog\/ja\/wp-json\/wp\/v2\/comments?post=30426"}],"version-history":[{"count":0,"href":"https:\/\/www.dotcom-monitor.com\/blog\/ja\/wp-json\/wp\/v2\/posts\/30426\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.dotcom-monitor.com\/blog\/ja\/wp-json\/wp\/v2\/media\/30434"}],"wp:attachment":[{"href":"https:\/\/www.dotcom-monitor.com\/blog\/ja\/wp-json\/wp\/v2\/media?parent=30426"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.dotcom-monitor.com\/blog\/ja\/wp-json\/wp\/v2\/categories?post=30426"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.dotcom-monitor.com\/blog\/ja\/wp-json\/wp\/v2\/tags?post=30426"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}