Installing Windows 2008 R2 into existing Domain AdPrep /ForestPrep

Goal: Install first windows 2008 R2 Domain controller into existing 2008 Forest/Domain.

Problem: Receiving fallowing error, upon running DCpromo “To install a domain controller into this Active directory forest using “adprep /forestprep”.

The Adrep utility is available on the windows 2008 R2 installation media in the \support\adprep folder

Solution:

You need to log into one of your existing domain controller (Infrastructure Master) and copy the folder mentioned in the above error to let’s say C drive.

To see the FSMO roles, simply go to command line and run

• netdom query FSMO

So you are going to be running below command from your Infrastructure Master, not the new R2 DC you are trying to bring up.

Summarize task

• Log in DC ( Infrastructure Master)
• Copy support\adprep folder into C drive of your existing DC
• Open command line
• Run AdPrep32 /ForestPrep (I ran Adprep32 because my existing DC is 32 Bit)
  Wait ForestPrep to finish
• Run AdPrep32 /DomainPrep (I ran Adprep32 because my existing DC is 32 Bit)
• You are done now go back to Windows 2008 R2 you wish to DCpromo
• Run DCpromo and fallow the wizard

Adprep TechNet

Oz Casey Dedeal

MVP (Exchange)
MCITP (EMA), MCITP (SA)
MCSE 2003, M+, S+, MCDST
Security+, Project +, Server +

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