aslamnotes

telnet

1 min read

Simple TCP client to test connectivity

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man telnet

Common usages

telnet host port

Typical uses:

  • telnet host 22 → SSH port reachable?
  • telnet db 3306 → DB port reachable?
  • telnet app 8080 → service listening? Failure patterns:
  • Connection refused → service not running / wrong port
  • Connection timed out → firewall / routing issue
  • Hangs then closes → proxy / LB issue

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