Haha i just saw a similar thread like 5 minutes ago. ^_^
nexon says that the servers are up, but some vista users cannot open.
Originally Posted by Nexon
If you are affected by this issue, try rebooting your computer and make sure that you are running Combat Arms as the computer's administrator.
i tried everything i can think of, and the only advice i can give you is to try turning off virus protection and compatability mode. if that doesn't work, try rebooting your computer. if THAT doesn't work, try deleting ca, restarting your computer, and reinstalling the game. sorry if that doesn't help. i tried