Online game wont work

Ive been playing command a conquer generals for months and suddenly it has stopped working. I have tried it on another connection and it still does work. I have reinstalled the game and this has not fixed it furthermore i have checked the servers and the game is up and running fine. This leads me to believe this may be a firewall issue? Maybe a new norton update has screwed with the settings. i have added the game as an expection but its still not working. Pulling my hair out over this one.

 

thanks for the help in advance