ARMA3 Server mods not showing on game launcher

If Arma 3 launcher only shows some of your server mods, the server may not be sending enough mod metadata to the Steam client. Increase steamProtocolMaxDataSize in server.cfg, then restart the server.

1. Open your Arma 3 server in the control panel.
2. Click Configuration Files.
3. Open server.cfg with Text Editor.
4. Find steamProtocolMaxDataSize.

   

5. Increase the value. Start with 2048, then increase in 2048 increments for larger mod lists.
6. Click Save & Exit.
7. Restart the server and refresh it in the Arma 3 launcher.

Example:

steamProtocolMaxDataSize = 8192;

This does not install missing mods by itself. It only increases how much mod information the server can advertise to the launcher.

Before you start

Make one change at a time and keep a note of what you changed. If the server is active, warn players before restarting or applying settings that may disconnect them.

If you get stuck

Check the control-panel console or latest log output for errors. If you submit a support ticket, include the server name, the change you made, and the exact error message.