Usually a server will not show up in-game if there is an outdated mod (one that has not been updated for the latest version of the game), or an otherwise broken mod installed on the server.

To fix the issue, you will need to go through the mods using trial and error to locate the problem mod by removing them until the issue is resolved.

Once the problem mod/s have been found you can remove them from the server and notify the developer of the issue.

We recommend you do this on a test map, and taking a backup of your current map before proceeding with the testing.

Ensure in your settings you have not set the 'Online Mode' to Private/Friends or have assigned a Steam group. These will all stop the server appearing in the lists.
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