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ERROR_DS_PDC_OPERATION_IN_PROGRESS
The PDC emulator is busy with an operation requiring exclusivity
Some security-principal and migration operations are serialized through the PDC emulator because they need a single authoritative coordination point. This status is not a generic indication that the domain controller is overloaded. It means another operation already owns the PDC-specific state or checkpoint that the requested directory change needs.
Identify the PDC emulator for the affected domain and correlate Directory Service, SAM, and migration logs at the time of the request. Determine whether another cross-domain move, SID-history operation, password-related task, or administrative workflow is still active. Wait for that operation to reach a terminal state rather than repeatedly submitting competing requests. If the condition persists, investigate a stalled service or incomplete migration transaction before considering role transfer.
What to inspect
- Confirm which DC currently owns the PDC emulator role.
- Find the earlier operation that obtained the exclusive PDC state.
- Avoid parallel migration batches that target the same coordination path.
References
- Microsoft: PDC requirements for SID-history operations
- Microsoft: role-owner requirements for domain moves
- MS-ADTS: role-owner constraints
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