Try disabling router and computer firewall to see if it gets any better. If yes, one of them are blocking something
Quote from CyanOnur :I don't really know how to forward, I'd love it if you can help though. Update: It wasn't forwarded in the first place, forwarding didn't help. Didn't read good thought u tried to set server up no port forwarding is needed when u just try to play the game but it seems udp is blocked. Try unplug and plugin (reboot) all devices (modem router switch) etc
Sorry for bumping this topic, but i had the same today with my [DTC]Timeattack server. My fix was to change the gameport number, and everything is fine now.