By default, Telnet is not enabled on Windows 10. To use Telnet, you'll need to enable it first. Here's how:
Re-enable Telnet using one of the methods above. Then close and reopen Command Prompt. The environment variables refresh only when you start a new session. how to run telnet towel.blinkenlights.nl on windows 10
You can enable the client using either the Control Panel or the Command Prompt (as an administrator). By default, Telnet is not enabled on Windows 10