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ERROR_DS_SCHEMA_UPDATE_DISALLOWED
The target DC does not own the forest-wide schema update role
The Schema Master is the single FSMO role holder that processes updates to the Schema naming context. Other domain controllers replicate completed schema changes but are not interchangeable write targets for a schema modification. This error is therefore a role-routing failure, not a malformed class or attribute definition.
Find the current Schema Master and verify it has completed required inbound replication since Directory Services started. Microsoft notes that FSMO roles are active only after the role holder has replicated the naming context that stores the role. If the Schema Master is permanently lost, seize the role to a healthy DC and clean up the old server metadata before performing further schema work.
What to inspect
- Locate the current Schema Master and confirm the role owner object.
- Verify successful inbound replication of the Schema NC since startup.
- Perform schema changes through supported tools against a valid role holder.
References
- Microsoft: Active Directory FSMO roles
- Microsoft: transfer FSMO roles
- Microsoft: Windows Server AD schema updates
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