Multiple Client Join from the same Nat bug

[baff]

multiplayer NAT bug.

behind a nat all clients can join a server.
This server can also accept joins from internet users outside the NAT as long as it is set to "internet". (for an internet game each client must have their own cd key).

the problem occours when multiple clients (with their own cdkeys) behind the nat attempt to join the same server online. At which point, only 1 is able to and the rest hang, unable to connect.