Linux from the command line | Linux for sysadmins - using telnet as a diagnostic tool
This is an old old sysadmin's trick, using telnet to diagnose connectivity problems, one that's mostly been forgotten in the age of complex GUI tools and smartphone apps and that's a shame because it's a quick, powerful, and ubiquitous tool worth using in your early diagnostic stages of resolving connectivity and service issues.
https://bash-prompt.net/guides/telnet/
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