JJ2 is fairly tempermental when it comes to ports... I know it has a hard time working through most firewalls, even if you have the ports open. Not sure why.

You do have all the ports open and forwarding to your correct IP? Sure you have the ports open to both UDP and TCP traffic?

I can only suggest things, since I've never gotten it to forward ports through. At least for hosting purposes. I think I've been able to get out to connect to other folk...