Dear All I have 2 domain controller in my organization, and I want to remove the first domain controller for this and add it later on, What I did I transfer the 5 FSMO roles from the first to the seconded domain controller and also I made the 2nd domain controller as GC, I remove it from the first one. In the same I did for also DNS. I try to dcpromo down the first domain controller I am getting this error The Operation Failed because : A domain controller could not be contacted for the domain abc.com that contained an account for this computer. Make the computer a member of a workgroup then rejoin the domain before retrying the promotion. " the specified domain either does not exist or could not be contacted." Any Help will be appreciated Regards Qusai