you cant log on, or connect to novaworld, or can't connect to games?
take a look at the threads below, it might help. personally i doubt the router or a firewall would cause problems with connecting unless one was hosting, because we have had 3 players on the same LAN in the same game on landwarrior.
http://www.dfhq.net/forum/showthread...threadid=12605
http://www.dfhq.net/forum/showthread...threadid=12586