We had some driver difficulty that led (eventually) to ThrobbleServ disappearing off GameSpy for a few days. We seem to have fixed the problem, so welcome back!
If you're interested in the solution, read on....We thought it might relate to WNW ports, as was discussed previously:
Try this thread on the Bioware NWN Server Admin forum: (Link)
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However, that didn't fix the problem. We also had to open some ports specific to GameSpy, as discussed here:
Bioware Technical ForumCheck out the second post (by Filchin) about GameSpy ports.
-Throbblefoot