Call of Duty Black Ops - no multiplayer?

[Pitagora]

hi,
i try to play some COD Black Ops purchased from appstore, but i can't get it work.

wHEN I GO MULTIPLAYER, it says i have a bad internet connection, or the game center is not on, but i know that my internet connection is good and is wired, not wifi, so what can i do?

 

[Pitagora]

now, i manage to go on multiplayer, but i don't se any server. This thing become so frustrate..