It’s very rare that you will use Telnet these days, so it took a long time for me to notice that by default it was not packaged with Windows 7 or Windows Vista. The reason more than likely this was an attempt to make Windows more secure by default, as Telnet is very insecure and whenever you have the choice you should always use SSH (Secure Shell). However, with that being said, you can quickly re-enable Telnet by following these steps:
- Control Panel
- Programs And Features
- Turn Windows features on or off
- Check Telnet Client
- Hit OK
After that you can start Telnet via Command Prompt (Ctrl + R –> type cmd and press enter).
To disable just do everything backwards.