The website is painfully broken at the moment and I don’t have a time frame for it’s recovery. Essentially, it appears that port 80 has quit passing through the router for no good reason. But I don’t know and can’t find a good reason why. It may be several days before things are fixed since I can only work on it at night.
Things are Really Broken
Archived post from 2006. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.