We have about 15 locations and each location has it's own subnet and Domain contoller. The DC acts as an application server too for a few location specific applications.

We mostly have Windows XP PCs, but have some Windows 9x, 98 clients in 3 locations that will not be replaced or 1.5 years. PCs at those locations will fail to map drives on occassion. It is diffent PCs at different times of day, though the error occurs more frequently in the morning.

At location "B" we tested logging on with a test user that is using a test script I created.

We will have to conduct more tests, but the one time the mapping did fail, it used the domain controller at location "A".

Based on the check points I put in the code, it failed to find any group memberships for the user, thus the mappings failed.

The newest DC client is on all the 9x boxes. We use KiXScript editor to make an EXE and that EXE does include kx16.dll, kx32.dll, and kx95.dll. As part of the troubleshooting process, we put them in c:\windows\system32 at an earlier time to see if that helped the issue (it didn't).

The Domain Controller that the client connected to when it failed to map drives has the same version of the Kix RPC service installed as all our other DCs.

What could be causing this intermitten failure to recognize group membership?