Source Engine
Default ports
Both Source engine and GoldSrc engine use the following ports by default.
Game Port: 27015
Query Port: 27015
RCON Port: 27015
Client Port: 27020
Source TV: 27005
Static Port Mapping (NAT/Docker)
The port that is configured in the start parameters must be the port that is exposed to the Internet. This is because the game server reports the port that it is configured in start parameters to use to the master server. If this does not match the game client will not be able to connect to the server.
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