I am trying to add a domain controller to a network with 1 existing domain controller. The existing machine is running Windows 2003 server ADS, with all the latest security updates and patches. The new machine is also running Windows 2003 server with all patches and updates, but it release 2. The versions are identical. When I do the dcpromo on the new machine, I get the following error message:
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 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"
This makes no sense to me as the adprep tool is used to prepare a windows 2000 server ADS for 2003 schema unless I'm wrong. What is wrong here?