/SLASHPLAY
How to change the port of a CS 1.6 server
Add +port 27016 to the server's launch line and restart. Players then connect to the server's IP on port 27016; the default is 27015.
port
UDP port the server listens on. Players connect to the server's IP and this port.
port <port> Examples
port 27015 The default, typed on the launch line as +port 27015.
port 27016 A second server on the same machine.
Arguments
portRequired- UDP port number.
What it does
Sets the main UDP port of the server, 27015 by default. Set it on the launch line with +port, because the network socket is opened once at startup and changing it later does nothing. Each server on the same IP needs its own port.
Good to know
hostportandip_hostportoverride it when set above 0.
Run it on your server
On a SLASHPLAY server, type it in the Console tab of the server page; the reply shows right under it. A value set there lasts until the server restarts. To keep it, add the line to cstrike/server.cfg. New to this? Start a CS 1.6 server first.
Your own
CS 1.6 server.
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