The following TCP and UDP ports must be open on the firewall or proxy server:
Using DirectX 7 method:
Connection Ports for Client Configuration Ports for Host Configuration
Initial TCP Connection 47624 Outbound 47624 Inbound
Subsequent TCP Inbound 2300-2400 2300-2400
Subsequent TCP Outbound 2300-2400 2300-2400
Subsequent UDP Inbound 2300-2400 2300-2400
Subsequent UDP Outbound 2300-2400 2300-2400
Using DirectX 8 method:
Connection Ports for Client Configuration Ports for Host Configuration
Initial UDP Connection 6073 Outbound 6073 Inbound
Subsequent UDP Inbound 2302-2400 2302-2400
Subsequent UDP Outbound 2302-2400 2302-2400
For more information check this thread:
http://support.microsoft.com/default...;EN-US;q240429