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dcpromo fails with please run adprep \forestprep

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?
1 Solution
James HIT DirectorCommented:
Are the 2003 servers 32 bit?
If so, then you need to run:
adprep32 /forestprep
adprep32 /domainprep/gpprep
Just to add, doesnt that need to be run from the 2008 disk on the 2003 servers?
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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
Has the domain and forest level functions been raised and upgraded?
carl_dvorakAuthor Commented:
adprep32 was what I needed.

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