This server is for low pings only
“This server is for low pings only” error appears when your ping is higher then permitted. “This server is for low pings only” message appears on the ET screen right after getting kicked from a server.
Usually at any server the maximum ping is set to 600, so if yours are higher, the server automatically kicks you, because you also cause the other players to have higher pings and this makes playing almost impossible. Your increased ping might be just temporary, so try to reconnect to the same server again. If you have any torrent or other download running, close it until you finish the game. Sometimes restarting your Internet modem might help also.