Short and sweet. I have a small domain with one 2K DC. The server is being replaced with a new 2K3 server. I planned to run dcpromo on the 2K3 DC, migrate all server roles, and then run dcpromo (demote) the old 2K server. I ran 'adprep /forestPrep', 'adprep /domainPrep', and 'adprep /domainPrep /gpprep'. No errors. I also ran 'dcdiag /s:server' and passed all tests.
However, when I run dcpromo on the 2K3 server, it fails. I get this error message:
"The version of the Active Directory schema of the source forest is not compatable with the version of Active Directory on this computer."
It further tells me to run adprep on the schema master. I tried to run the adprep commands again and get this message:
Forest-wide information has already been updated.
Adprep did not attempt to rerun this operation.
How can I promote the new server if it doesn't recognize that the tools have been run? I did attempt to run dcpromo once before remembering to run the adprep tool. After running the tools, I rebooted the 2K3 server, in case there was some kind of cached results, but it still fails, and I have tried 3-4 times.