TCP Hole Punch (NAT Traversal) Library or something?

Question

I want to do TCP Hole Punching (NAT Traversal) in C#. It can be done with a rendezvous server if needed. I found http://sharpstunt.codeplex.com/ but can not get this to work

Answer 1

http://sipsorcery.codeplex.com has a working stun server.

SipSorcery.core -> SipSorcery.Net -> Stun