I don't think it has a very good success rate. I'm guessing that for a truly reliable TCP solution you would need to throw everything at the wall and hope somet

I don't think it has a very good success rate. I'm guessing that for a truly reliable TCP solution you would need to throw everything at the wall and hope something sticks: uPNP, NAT-PMP, and maybe this STUNT/ICE-TCP thing.