"No route to host" means that your tremulous cannot find the server for some reason. If you know you're connected to the internet at the time, and know that you can get to the server (another tremulous client connects to it), then the problem would appear to be with tremfusion, in which case you would have better luck looking for support on the tremfusion forums. Otherwise, you need to obtain a stable internet connection, or play on a different server.
