Follow the simple instructions below :

1.Add a protocol to the Winsock Proxy called Battle.Net.
2.Set the initial connection to 6112/UDP and TCP incoming and outgoing.
3.On the client computer in the "mspclnt" folder, add the following to the Mspclnt.ini file:

[starcraft]
RemoteBindUdpPorts=6112

[diablo]
RemoteBindUdpPorts=6112

This will signal the proxy to reserve the remote UDP port 6112 when "starcraft.exe" or
"diablo.exe" is run.