Multiplayer Mode Issues

From what I have found out…If you join a server and then want to change servers, you need to close out the game and then start it back up. Also, you must disable your firewall or at least set the firewall to allow incoming connections from this app. These solutions have helped me and I can now play multiplayer mode. Not as good as COD4 multiplayer, however.

NCBOYE about Call of Duty® 2