I registered on this forum just to say thanks to the post above this!!!!
I have been trying to get TVersity to work for about four days, trying everything from router settings to changing ip to uninstall and reinstalling. THIS WAS WHAT WORKED. Thanks so much.
Just a note to anyone else who is experiencing problems connecting the 360 to Tversity:
1) If you've been troubleshooting as much as I have, chances are you've changed some things on your system and forgotten what was changed or how to change it back. This site was very helpful to me and actually got Xboxlive running again (xbox live yes, but still not tversity...ironically... but hey! It's a start) : http://www.blackviper.com/WinXP/registry.htm The link is for WindowsXP which is what I run, but I think he has the same for other OS's. It will set all of your services back to default.
2) AFTER I did this, the solution above worked. Note that it is not necessary to use static ip's or change too many complicated settings. JUST these two steps is what did it for me.. unless I do still have some settings configured that helped... but it's worth a shot to try this. I did have my firewalls disabled while trying the solution of the poster above this, but I'm pretty sure that's not what did it. Have disabled them before and it never helped.
Thanks again to the person above this and to all on this forum! The forum has been a great resource in working to fix this problem!