For ages it was enabled by default. Since Windows 7, Telnet client is disabled and so many times I caught myself trying to use telnet command to test some connectivity based on TCP port and hit the wall forgetting this fact.
OK, let say you want to test TCP port 80 on cnn.com in order to check serviceability. Remember, TCP port 80 is native web port. Go to Start – Control Panel (Slide 1.).
Then go to Programs and Features (Slide 2.).
In Programs and Features window navigate to Turn Windows features on or off and then locate Telnet client in showing dialog (Slide 3 & 4). Check box on the side of Telnet client and press OK.
You have to wait few minutes for installation to be done. After that start your command prompt and type telnet cnn.com 80. If you receive black screen like you see on Slide 5. you telnet session is established and communication on TCP port 80 is working. Telnet command you can use to check any TCP port and verify communication.
I hope that this tutorial was informative to you and thank you for visiting this website.