PlayStation®Network Support

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I just started attending a university and like most students moved into a dorm, since i cannot survive without my ps3 of course i brought it with me. When i am connected to the dorms wifi i cannot sign into psn. The internet works great, the browser works just fine but for some reason i cannot connect to psn, i always get a error. The wifi does have proxies, that might be why but im not sure. Any help would be greatly appreciated