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Source Dedicated Server

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The Source Dedicated Server or SRCDS is a tool that runs the server component of a Source game without the client component. In other words, it simulates the game without drawing it. SRCDS is chiefly used by server providers who want to serve up as many games from the same computer as they can.

This page, however, is aimed at mod developers who want to run SRCDS on their home computer. Doing this is a must if you are creating a multiplayer mod as the behaviour of dedicated servers differs from that of listenservers (those started from the main menu) in some areas. Crashes that only happen on a dedicated server are entirely possible!

Connectivity

No matter which type of server you are using, your computer must be able to receive unsolicited incoming connections. This is exactly what routers and software firewalls exist to prevent, so if you are using either you will have to reconfigure. Refer to the manufacturer instructions for how to do this.

The ports SRCDS officially requires are:

  • 27015 TCP/UDP (game transmission, pings and RCON)
  • 27020 UDP (SourceTV transmission)

SRCDS has also been spotted opening connections on 27005 and 51840 UDP, but these may be outbound only.

See also

References

[1]