My Bitdefender Internet Security And Warcraft 3 Frozen Throne

hey guys i need your help....when ever i enter warcraft 3 frozen throne and play under Local Area Network, it says Could not connect to network..

i have never encounter this problem before and i don't know what to do. Before i installed bitdefender total security i was using bitdefender antivirus plus v10 and had never have this problem.

i think it has something to do with the firewall or something... i'm not really sure.. please help?