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STATUS_DS_DOMAIN_NAME_EXISTS_IN_FOREST
The forest already contains that DNS domain name
Active Directory forest naming is unique. This status means the proposed trusted-domain DNS name collides with an existing forest name, domain tree, or trust-related naming record.
The failure is not fixed by retrying against another DC. Investigate the forest configuration naming context, existing trust objects and any domain rename or migration residue.
What to inspect
- Search the configuration naming context for the proposed DNS domain name.
- Check existing trustedDomain objects and domain partitions.
- Verify whether a domain rename or decommission left stale naming metadata.
References
- Microsoft: Active Directory FSMO roles
- Microsoft: Rendom domain rename tool
- Microsoft: Global Catalog
- Microsoft Open Specifications: NTSTATUS values
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