My particular problem is that I cannot join any games through system link. Let's take CoD:Black Ops 2 for example, I downloaded all the TU's got the latest one activated, I open the game, open system link, join a room, I refresh the lobby in "Join Game" section, I see current ongoing online maps made by fellow gamers but once I try to join, it just simply says that I cannot join, no other reason given. The message that appears is within the game.Any ideas on how to fix this?