NetDirect Client + Vista = TapAdapter IP Not Assigned Error

[cameroncf]

Among the many many pleasant experiences I've had cussing at Vista is this problem with getting the NetDirect Client to work with Vista. I'm the end user here, not the VPN admin so go easy on me if I leave out a detail or two...

I have two computers running this virtually identical Vista configurations. One works, one doesn't.

I'm on Vista Ultimate, and have tried getting NetDirect to work in both Firefox and Explorer. Essentially, I get to the point where the little popup window opens up, I can see the NetDirect icon in the systray, and the client appears to be starting up. Then I get a long pause in feedback and an error. The output I see in the popup is as follows:

Downloading zip file...
Extracting zip file...
Loading library...
NetDirect: Initializing...
[[[ long pause here ]]]
NetDirect: TapAdapter IP not Assigned
NetDirect: Stopping...
NetDirect: Stopped!

At this point the window closes and the systray icon goes away. I've tried a number of things including starting the browser "as Administrator" and also have searched Google for answers without any luck.

Anyone have any suggestions? Is there a way to get more verbose debug output from the NetDirect client perhaps?

Thanks!

-Cameron