Adding 2008 R2 DC to 2003 Domain

Posted on 2011-10-16
Last Modified: 2012-05-12
Have existing 2003 Domain w/Domain controller.
Ran adprep32 /forestprep (Completed Successfully)
Ran adprep32 /domainprep (Completed Successfully)
Added my 2008 R2 member server to domain (Completed Successfully)
Rebooted 2008 R2 server
Shutdown 2008 R2 server
Rebooted 2003 Server "Domain Controller"
Powered up 2008 R2 Server

Gives me an error saying that I need to run adprep on the existing domain controller.

If I try to re-run adprep it says that the schema has already been updated and cancels the adprep...

Where do go from here?
Question by:tech911
    LVL 2

    Expert Comment

    You are missing "adprep /domainprep /gpprep" and "adprep /rodc" (this step is optional, you can omit it if you are not planning on deploying RODCs).
    LVL 37

    Expert Comment

    Is there ONLY one DC in 2003 domain? If not then has replication completed?
    LVL 3

    Author Comment

    I did run the optional steps I and they completed successfully.

    There is only one DC currently.  It is a 2003 Enterprise Server w/SP2.

    LVL 5

    Accepted Solution

    Make sure your running in 2003 native mode, not 2000. Then run Forest prep on the DC holding the Schema Master role, and domain prep on the DC holding the Infrastructure Master role.

    LVL 3

    Author Comment

    The functional level of the Forest and the Domain needed to be raised.

    I raised the functional level of the forest via  Admin tools > Domains and Trusts
    I raised the functional level of the domain via Admin tools > AD Users and Computers

    I ran DCPromo and it worked.

    Nice catch.
    LVL 3

    Author Comment

    So here is the complete solution

    1.) BEFORE you run adprep make sure your functional levels are at least 2003 or better.
    2.) Run Adprep or adprep32 and include each available option

    adprep /forestprep
    adprep /domainprep
    adprep /domainprep /gpprep
    adprep /rodcprep

    3.) now run dcpromo on you new DC and it should add nicely ( I would also review the various posts about adding a DC to an existing infrastructure as there are various messages that pop up that you will need to know how to respond depending on your situation.
    LVL 5

    Expert Comment

    allot of people miss the functional levels.

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