All of our domain controllers (2) are Windows 2008 Standard 32 bit.
We are trying to add a Standard 2008 R2 64 bit domain controller to the forest but for some reason during DCPROMO, we receive the following error:
"to install a domain controller into this active directory forest,you
must first prepare the forest using "adprep/forestprep" etc
We went ahead an ran adprep /forestprep on our established domain controller and allowed time to replicate. When attempting to execute dcpromo again, we receive the same error. What gives?
Best Answer
You need to run adprep /forestprep ON the existing DC holding the Schema Operations Master role. You need to run adprep/domainprep /gpprep ON the existing DC holding the Infrastructure Master Operations Master role. You run adprep FROM the W2K8R2 installation DVD. If you're running it on a 32 bit DC then you'll need to run the 32bit version of adprep (adprep32.exe). Adprep can be run from the \sources\adprep folder on the W2K8R2 installation DVD.