This error is showing up in quite a few forum posts with no definitive solution. I was able to resolve this for a MOSS 2007 small farm running on Windows Server 2008 64-bit. The main symptom is that when you try to open your search settings in the SSP, you get this message [...]
Microsoft has written a step-by-step instructional for setting up a proof of concept lab to demonstrate NAP with 802.1X on the new Windows 2008 NPS. NPS on Windows 2008 replaces IAS on Windows 2003, and new Network Access Protection functionality is now built in. The guide can be downloaded from here: http://www.microsoft.com/downloads/details.aspx?FamilyID=8a0925ee-ee06-4dfb-bba2-07605eff0608&displaylang=en. The [...]
How to use a phased approach to migrating SharePoint sites off a Windows 2003 server onto a Windows 2008 64-bit server.