Upgrading to Windows 2003 AD. AD Install wizard says i need to adprep, but i already have
We are trying to upgrade our Win 2000 AD to Win 2003. We tested the upgrade in a virtual environment and eveything went pretty smooth. When we tried it tonight in our live environment during the Windows 2003 AD wizard setup I got this error:
The operation failed because:
The Active Directory Installation Wizard cannot continue because the forest is not prepared for installing Windows Server 2003. Use the Adprep command-line tool to prepare both the forest and the domain. For more information about using the Adprep, see Active Directory Help.
"The version of the Active Directory schema of the source forest is not compatible with the version of Active Directory on this computer."
When i run adprep /forestprep and /domainprep it says that it's already been done (which i did a while ago when i installed Exchange 2003). I also checked and i dont have the mangled LDAPDisplayName attributes. the only difference that i can think of between the virutal and live environment is that i did one last windows update to make sure i had all the critical updates installed. Not sure if that would have done anything. I dont see anything in the event viewer logs.
Microsoft Server OSActive DirectoryWindows Server 2003
Also, have all of the DCs replicated since the adprep was successfully run. Untill the entire directory is consistent on the schema the check at upgrade will fail (even if the local copy is correct). And lastly (and perhaps an obvious one, but it must be asked) has the server been rebooted and adprep tried again (you'd be amazed how often that works)?