Thank you a bundle for the answer. I added the line
ListenAddress 188.8.131.52 (The IP is the Univ. unix-servers IP)
to my sshd_config file.
I'm not sure how to restart the sshd though. I was told that I actually should restart ssh (because I can't find any swithes related to restarting sshd spesifically), so I did it using the commands
and ./ssh restart
These seemed to restart the Secure Shell Server. But alas... the netstat still doesn't show that my machine is listening to the ip-address entered above. It's only showing up my open connection to irssi (irc-client, state ESTABLISHED) and something related to exim (local address 0.0.0.0, localhost? State is LISTENING)
I also entered the ipchains commands you gave me. Naturally the problem still desists, but I'm pretty sure that is because of the problem mentioned before.
Did I restart the sshd properly? Thanks for the patience