Why do some Internet applications not work?

Dormitories connected to the University's network are subject to the rules of the firewall that separates the university's network from the Internet. Thus, the services that can be used are also restricted. Allowed are http, ftp, pop3, irc, imap and smtp with well known smtp servers. Use of the University's servers is limited to the Novell servers and the Internet servers. Again, the clearance extends only to the required services.