→ Host unreachable or port closed 📌 Quick Reference # Enable Telnet (Admin) dism /online /Enable-Feature /FeatureName:TelnetClient Test HTTP server telnet example.com 80 HEAD / HTTP/1.0 [press Enter twice] Test SMTP telnet mail.server.com 25 HELO test.com Exit Telnet Ctrl + ] quit Note : Windows 11 may prompt you to install Telnet via "Optional Features" in Settings → Apps → Optional Features → Add a feature.
Would you like a deeper dive into any specific Telnet use case or alternatives like Netcat? telnet for windows
→ Service not running or firewall blocking → Host unreachable or port closed 📌 Quick