Cant connect to PSN

your best bet would be to look on the playstation forums. There probably is a quick help guide to anwser most questions like this.

But if you would like help here, what are the errors it is giving you? Is your campus blocking psn's service?

Chances are your University blocks some of the ports needed to connect (many do). If that is the case you can request they unblock the following, but be prepared to be told no  


TCP:
80
443
5223
UDP:
3478
3479
3658 should also be opened for voice chat.