I have a 2003 windows server as our domain controller and I am trying to upgrade the active directory to one of our new virtual machines running windows server 2008r2.
I ran through all the steps I thought I needed on the 2003 machine. Adprep /forestprep and adprep /domain prep. Went into the registry and found the entry saying that shows my active directory is on version 44 which is windows 2008r2.
At this point I logged into the new 2008 server and ran through the active directory domain services installation wizard and once I got to the part where it lists domains and I must pick one, my domain is in the list. I select that domain and click next only to receive the error…
To install a domain controller into this active directory forest, you must first prepare the forest using "adprep /forestprep". The adprep utility is available on the windows server 2008 r2 installation media in the \support\adprep folder.
I even went back into the 2003 machine and tried running all the commands again and it just comes back saying they have already been run and been upgraded.
Has anyone run into a problem like this before or know what is causing this.
Best Answer
Active Directory Schema Version 44 is Windows Server 2008 RTM.
If you are going to dcpromo promote a Windows Server 2008 R2 member server to a domain controller, the schema version has to be at 47 -- Windows Server 2008 R2 RTM.
Run adprep from the \support\adprep frolder on the Windows Server 2008 R2 DVD on your Windows Server 2003 domain controller with the Schema Master FSMO role.