title: STUN server for TCP flow
body: <p>I am looking for a reliable STUN solution for the TCP flow. I have tried STUNT (by cornell University in the US) and XSTUNT (by a University in Taiwan). But they both seem old and useless.</p>
  <p>What I want to do is to transfer files between two clients in two different networks via C#. Please let me know if you have any solution for either of the following:</p>
  <ol>
  <li>And UDP-based Client/Server solutions for C#</li>
  <li>Any TCP-based STUN server</li>
  </ol>