Forcing the Removal of Domain Controllers
A domain controller must have connectivity to other domain controllers in the domain in order to demote the domain controller and successfully remove Active Directory Domain Services. If a domain controller has no connectivity to other domain controllers, the standard removal process will fail, and you will need to connect the domain controller to the domain and then restart the removal process. In a limited number of situations, however, you might not want or be able to connect the domain controller to the domain and instead might want to force the removal of the domain controller.
Forcing the removal of a domain controller is a three-part process. You must:
Restart the domain controller in Directory Services ...
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