Thanks to devilsclaw we can now all play DF1 and DF2 online using the NovaWorld lobbies once again. He has made a patch that allows the game to properly contact the NovaWorld servers that list the games.
Download the DF1 Patcher here:
http://www.novahq.net/files.php?ID=541
Download the DF2 Patcher here:
http://www.novahq.net/files.php?ID=540
More info to come. In the meantime, make sure to join the NovaHQ CTF server