I've been able to do a standard host from behind a firewall, and even
join a multi-player server with both of my machines simultaneously,
but when I run a dedicated host with the same settings (and Dedicated
Host 1 config line), nobody joins and the game isn't visible from my
other machine.
I only get the "Multiplayer" and "Options" tabs on dedicated like the
web site says I should, but when I go into the track selection, there
is no GO button next to the number of laps. I think maybe I'm not
truly starting the game.