TCP Port Monitor - TCP Port Monitors Using Telnet

Port Monitor - The Mechanism

TCP port monitoring is one of options developed by Dotcom-Monitor^® which allows you to check Internet services in one more way. How does port monitor works? Our agents from all over the world will try to connect to the server specified on the specified port and see if the remote computer accepts connections on this port. If the connection is not accepted the service is probably down and the notification process will start. Dotcom-Monitor^® realize TCP port monitoring using telnet.

TCP Port in Networking

In computer networking, a port is identified by number system resource allocated to an application running on a host network, to communicate with applications running on other network hosts (including with other applications on the same host).

In a typical client-server model application is waiting for the incoming data (or the connection request, "Listening TCP port"; the role of server), or sends data (or the connection request) to the known TCP port, opened by the application server (client role).