TelNet Time-Out Issue

You question name contains Telnet + your tags say SSH.

Telnet != SSH.

If you're trying to use Telnet, rather than something like libssl, to connect make a TLS (SSL) connection, than your connection will fail.

Likely best to do error trapping + reporting + add a comment with whatever error returned.

Thanks for the response.  The tag says SSH/Telnet.  That is an EE tag.  I understand they are different but that was the one that EE provided that seemed closest to a TelNet tag.

Again, my TelNet is functioning.  I just need to know how to ensure that it doesn't time out over the span of anywhere from 1 to 12 hours.  Any help would be much appreciated.

With ssh a simple command line option handles this.

With telnet, you'll have to issue some command, like date or pwd every few seconds, as telnet has no built in way to keep connections alive.

So you'll really require an expect script, which runs telnet for you + continually issues some command to force keepalive.

https://unix.stackexchange.com/questions/424701/how-do-i-stop-a-telnet-session-from-timing-out provides a good overview + working example.

So expect will actually run terminal for you, then login, then pump some command across the line at some frequency using interact with a timeout.

If possible, switching to ssh allows this far more cleanly, as expect scripts tend to... have there oddities, when run over long periods...

Thank you both so much!