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ERROR_DS_RECALCSCHEMA_FAILED
Schema validation failed while rebuilding the schema model
Active Directory maintains an in-memory schema cache derived from the schema naming context. A schema update can require that model to be recalculated and validated before the new definitions are used for ordinary directory operations. This status means the recalculation failed, so the directory cannot safely activate the proposed schema state.
Look earlier in the update sequence for the specific schema consistency error that explains which class or attribute caused the rebuild to fail. The broad recalculation status is often the final stage, not the root cause. Microsoft documents schemaUpdateNow as a blocking rootDSE operation: a successful return means the cache is updated, while an error means the refresh was unsuccessful.
What to inspect
- Capture the first schema validation or directory-service event preceding this result.
- Review recently added or modified classSchema and attributeSchema objects.
- After correcting the definition, trigger schema cache update through supported mechanisms and verify success.
References
- MS-ADTS: schemaUpdateNow
- Microsoft: updating the Active Directory schema cache
- MS-ADTS: schema consistency checks
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