That is, your connection is to the college so their support is called on as they do the oddest things that can break what worked before. They know their network so their support is who you call next.
My college campus internet is made through a proxy connection but right now i can't connect to it anymore, i have been able to do it last week but right now, it does not want to connect, my roomates on the other hand can connect, no problem. I want to add, that while i was away on holiday, i made a PPoE connection back home. Is there any way that it could have mixed something up in the Internet settings?