Friday , April 19 2019

Decommissioning Child Domain gracefully – Operation Failed

If the domain is a Child domain and if you wish to delete Child domain entries / Trust from the root forest.

We need to Choose “Delete the domain because this server is the last domain controller in the domain”



We received an error while decommissioning the child domain

The Operation Failed because :

Active Directory Domain Services Could not be removed on this Active Directory Domain Controller because this is the last AD DC in the domain, and the domain has a child directory partition



Use ntdsutil to Delete the Child domain

Open the CMD prompt
Domain Management (In 2008 it changes to “partition management”)
Connections => connect to server DC01
List <— to see zones
Delete NC DC=DomainDNSZones,DC=Domain DC=Com (This Deletes the CrossRef Object)
Force replication, validate that the partition is gone.
Restart DNS, the service will re-add the partition.


Now Demote the Last domain in the Child domain. it should allow you to demote without any issues.

About Satheshwaran Manoharan

Satheshwaran Manoharan is an Microsoft Exchange Server MVP , Publisher of
Supporting/Deploying/Designing Microsoft Exchange for some years.
Extensive experience on Microsoft Technologies.

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