LAN Discovery
Many admins who have tried, reported a local server does not appear on the LAN tab in the steam browser.
LAN Discovery

Workarounds

Console Command

Connect using the console command.
1
connect IP:PORT
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If the port is 27015, then you can just use : connect IP
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connect 192.168.1.10:27025
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Add server to favourites

Add the server to the server browser's favourites. If in-game, then go to the legacy browser if applicable to find it. The syntax to use is the same as for the console connection.
Make sure your server actually works and is reachable on LAN, otherwise what you need is rather Troubleshooting first.

Fix

As this github issue shows, there might be a possible configuration that fixes the issue, but LinuxGSM devs were not able to reproduce it at the time of writing the doc, so this information is purely experimental and you are welcome to update it or post on the issue if you have useful information to share about it.
    1.
    Edit your Start Parameters using your LinuxGSM Config files
    2.
    Change ip="0.0.0.0" to an actual interface IP, for example ip="192.168.1.10" ; this will allow LinuxGSM to monitor and query your server properly.
    3.
    In the fn_parms section, add +sv_lan 1 and make sure you replace -ip ${ip} with -ip 0.0.0.0
    4.
    Make sure your server main port listens to one of these IP or IP ranges: 4242 ; 26900-26905 ; 27015-27020 ; 27215
Last modified 3mo ago