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DNS_ERROR_DS_ZONE_ALREADY_EXISTS
The DNS zone already exists in directory-backed storage
For a directory-integrated zone, MS-DNSP requires the server to select an application directory partition, verify that partition through LDAP, and search it for an existing zone before creating a new dnsZone object. This error is therefore tied to directory storage and replication scope, not merely to the local in-memory zone list.
Search the intended DNS application partition and compare replication scope on other DNS servers. A zone can already exist in AD DS yet be missing from one server because that server is not enlisted in the partition or has not loaded the zone. Creating another directory object is not the repair for a loading or enlistment problem; fix the server view of the existing zone.
What to inspect
- Determine the exact application directory partition selected for the create operation.
- Enumerate the existing zone and its replication scope on writable DNS servers.
- Check partition enlistment and zone loading on the server that appears not to host the existing AD-integrated zone.
References
- MS-DNSP: DNS Server management operations
- Microsoft: Active Directory-integrated DNS zones
- MS-DNSP: zone and application directory partition management structures
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