SWAT 4 its official mainserver/masterserver list is down and the developers no longer support the game.
However, here at MarkMods we have made a patch for this issue.
All our game server come with the patch automatically, which is the MarkMod v13.1.
You may download it on our website as well.
Though if you face issues joining your game server, make sure to set in SwatGuiState.ini:
[SwatGame.ServerSettings]
bLAN=True
This may sound strange, as you want the server to not only run on LAN, but this is a work-around and the patch in MarkMod v13.1 or GezMod v22.1 will get the server online now.
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Last updated Sun 2 Feb 2014