Found and fixed the problem. Hosting a 15 player game. Make sure that you have PAStats installed and your server list set to show modded games before attempting to join.
Looks like until @warrenkc's server is restarted no more 40 player games unless someone else starts a server up. In the mean time I've got a 10 player FFA up on Uber's servers.
Another will be up within the next 10 minutes whenever the people using the server now stop using it!