Ports to forward for connection issues: UDP 9991 and 19900

If you have trouble playing online games (you never get QM matches, and friend matches immediately desync on the character select screen), try forwarding the UDP ports 9991 and 19900 in your home router.

Most players should not need to do this, but some routers work differently and will defeat our NAT punchthrough code, in which case manually forwarding the ports may work.