When promoting a Windows Server 2012 R2 to a Domain Controller failed… The other day, when I attempted to add a newly installed Active Directory to become the slave domain controller of a master, the error message “A domain rename operation is already in progress” was displayed. Promoting the Windows Server 2012 R2 server to a Domain Controller failed.
I was sure I never attempted to rename the original domain…
Assuming a domain rename operation was in progress (why?!), I ended that operation with
C:\>rendom /end The operation completed successfully.
After this operation, I could add my new slave domain controller.