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Cleaning Up After AD
If you've worked with Active Directory long enough, most likely you have run into situations where Active Directory domain controllers refuse to be demoted when you use the Active Directory Installation Wizard (dcpromo.exe). Even though everything else on your network seems to be fine, the demotion process will fail no matter what you do.According to Microsoft this can happen if "required dependency or operation fails," such as network connectivity, name resolution or authentication. If you've determined that these are not the culprit, then certain problems with Active Directory may be the cause, such as Active Directory unable to locate certain objects or problems with replication service.(continue at source)