There are a lot of reasons you could need to run sshd (the ssh server) on a port other than the standard port 22. These days the Internet is pretty convoluted. Sometimes you have too many hack attempts on port 22, sometimes you’re trying to work through a restrictive or oppressive proxy/firewall. I moved my sshd to a high port number on one server for the first reason.
Read the rest of “Running an SSH Server on Multiple Ports”…