SF4 - Weird Issue

Hi all, first time posting on here since I think you guys are the only ones who might be able to help me.

So I’m at college and a particular friend and I can no longer play SF4 online (says: “Unable to Participate”). However, with another friend of mine, I can host/join with no issues at all. The friend I can’t connect with has Time Warner, and I believe the ISP/Network my school uses is ResNet.

I have tried looking up into compatibility issues between the two, but as far as I know there is none. Since I can’t do anything with the router or use a VPN (Hamachi didn’t work either) and only doing port forwarding on his end won’t fix the issue, is there any “specific” way to get around this? When I was back at home we used to play all the time, but now that I’m at school he’s the only one (and a handful of other random people) I cannot play with.

Other games work fine that use other servers (Left 4 Dead, Battle.net, etc).

Added - also my apologies if this is in the wrong section or something, kind of desperate for any kind of answer, even if the issue has no solution. Greatly appreciated.

You might receive better answers/support in the tech talk forums.