Ok, thanks - so if I understand correctly then, it is listening on port 22 as a default, and not accepting traffic on any port.
That brings of the question: wouldn’t I be better off changing the SSH-port? And is that so easy as to uncomment the #Port 22 line in the config file and changing the port number to something random, and saving that somewhere? Would I then be able to connect by running ssh myuser@mydomain.com:, or would I need to do anything else to successfully connect?