dcpromo fails with please run adprep \forestprep

Posted on 2011-10-21
Last Modified: 2012-05-12
Adprep run successful to version 2 and 44 respectfully on 2003 domain (two domain controllers same site fully replicated) but 2008 R2 dcpromo fails with "To install a domain controller into this Active Directory forest, you must first prepare the forest using "adprep /forestprep"  The event logs are clean with no errors and I had no errors running the adprep /forestprep, adprep /dominaprep, adprep/domainprep /gpprep.  All were successful and confirmed in the schema. But a dc promo on a 2008 r2 server will not promote. Is it safe to run the forest prep again or do I have another problem?
Question by:carl_dvorak
    LVL 17

    Accepted Solution

    Are the 2003 servers 32 bit?
    If so, then you need to run:
    adprep32 /forestprep
    adprep32 /domainprep/gpprep
    LVL 10

    Expert Comment

    Just to add, doesnt that need to be run from the 2008 disk on the 2003 servers?
    LVL 57

    Expert Comment

    by:Pete Long
    LVL 59

    Expert Comment

    by:Darius Ghassem
    LVL 14

    Expert Comment


    on the schema operations master run adprep /forestprep

    then go on the infrastructure operations master and run adprep /domainprep /gpprep

    remember that you have to run those commands by using the executables that you find on the win2008 CD

    you can safely run those comjmands over and over because they just update the AD db and objects, if they are already updated it has no effect
    LVL 5

    Expert Comment

    Has the domain and forest level functions been raised and upgraded?

    Author Closing Comment

    adprep32 was what I needed.

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