I’m using a Digi CM 32, and have been unsuccessful at disabling Telnet, all incoming Telnet. We need a higher standard of security, and are only allowing SSH and HTTPS.
I have tried modifying the /etc/inetd.conf file, inserting a delimiter (#) in the line for Telnet, and saving, though after a reboot, the file is restored, no changes…
How do I completely disable Telnet? Any assistance you can provide would be much appreciated.
-Michael Tipsword, NSSA Univ. of Illinois
There are a couple of ways to go about doing this. Keep in mind my examples are based on current firmware, so if you aren’t on 1.5.0.5, you may want to upgrade if what I say doesn’t match what you see.
Over the web UI interface, you can disable incoming http under Network > Web Server Configuration. Telnet can be disabled under Network > IPFiltering (this is basically a GUI front end to iptables).
These things can also be disabled via iptables from the command-line interface. Here is an article using Telnet as an example of how to do this: