In Call of Duty 4 have you guys ever gotten the error message which states:?

"Waiting for Key Code Authorization". Randomly, when I try to join a multiplayer game online, on some maps, I get the prompt "Waiting for Key Code Authorization. Then the server counts down 10 seconds, and then an error message appears stating that the "Server Timed Out". I then cannot gain access to that particular online match. Have any of you encountered this, and do you guys know of a fix. I have legitimate copy of Call of Duty 4, which I bought from GameStop, with a proper registration key, not a hacked copy. Secondly, I have downloaded the latest Call of Duty 4 patch. Furthermore, I am playing on an unsecure network at Starbucks, so no firewall is blocking anything. I was just wondering if anyone has stumbled upon a fix yet. Thanks, in advance.