Hello, I currently run an SBS 2011 server environment and I am wanting to deploy a Server 2008 RODC. The forest and domain functional level is 2008 R2. The issue I am having is that when I run DCPROMO on the new Server 2008 server I am getting an error that states, "You will not be able to install a read-only domain controller in this domain because "adprep /rodcprep" was not yet run."
I'm guessing that this may be due to the fact that this is only a Windows Server 2008 OS and my functional levels are at 2008 R2, but maybe I am wrong? Is it possible to accomplish adding this Server 2008 RODC into my existing SBS 2011 environment with the functional levels set the way they are, or would there be something else causing this issue?