You guys have not been searching hard enough with Tunngle. First of all, you complain that there is only one person in the HoN room in Tunngle. It depends on the time of day, just like any other game in Tunngle.
Below is my Tunngle troubleshooting guide to get you started. Also check out my google document guide to hosting. There is hope. I can't wait to do a proper youtube video on this LAN game, it will surely raise the activity level, I guarantee it.
http://www.youtube.com/watch?v=oeLj8Kajh9g
http://docs.google.com/View?id=dhvc52g_6gv4v6gcj
Trivia fact: If you had posted your HoN Tunngle question in the Tunngle forum, I would have recognized your need for help because I check that forum almost daily. By luck, I decided to investigate LAN HoN and I found your thread. :)