Cant connect to servers

Hey,

After downloading the latest map pack I am unable to connect to the servers. It was working the day after the release of the map pack, but now it just doesn't work. I have tried re-downloading the latest Title Update and cleared the system cache. I have not done anything that could warrant a ban and no other game is affected, BFBC2, Borderlands, etc.

Any help would be appreciated, GT is OperatorTrick if anyone wants to check anything.

Thanks.