I've tried almost everything and still my Macbook Pro won't connect to the App Store! What else can I do?

I am in desperate need of help to connect to the app store! I've tried changing the DNS to 8.8.8.8 and 8.8.4.4, looked at the trust certificates (or whatever they're called) in KeyChain, typed endless commands into Terminal, turned off my FireWall and Parental settings, and a lot of other methods!

I am able to connect to the App Store from my University's network, but am unable to do so from my wireless internet at home.

Please help me out in what ever way possible!