Martix
When server launches after client starts it uses a different port, most likely 4977. You would need to port forward that port.

RaidMax
@RaidMax
Posts
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GameOnly Launches if Server Isn't Running -
The Plutonium T4 (WAW) Suggestions ThreadXool Xuicider It already exists?
https://wiki.zeroy.com/index.php?title=Call_of_Duty_5:_Mapping_MP