1. Change the ip of the matchserver to your localip. Not 127.0.0.1 or localhost
2. Let the clients connect to the same ip with you putted in step 1
Example:
Comp1 IP 192.168.2.2 [SERVER] Put in this ip in the server.ini and in the config.xml of the clients.
Comp2 IP 192.168.2.3 [CLIENT1]
Comp3 IP 192.168.2.4 [CLIENT2]