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ERROR_DS_CANT_CACHE_ATT
An attributeSchema object failed during in-memory schema loading
The directory service uses an in-memory schema cache so class and attribute rules are available during LDAP operations. This result identifies the attribute-loading stage: an attributeSchema object could not be represented in that cache. It is narrower than a generic LDAP value error and points to schema activation or cache construction.
Find the attribute definition being processed and correlate the event with preceding schema consistency errors, replication changes, or recent extensions. A cache reload is useful only after the underlying definition is valid. Microsoft documents that writing schemaUpdateNow to rootDSE causes the in-memory schema to be recalculated from the schema NC; an error return means that recalculation did not complete successfully.
What to inspect
- Identify the specific attributeSchema object associated with the cache failure.
- Check its syntax tuple, identifiers, link metadata, and range constraints.
- Correct the schema object before retrying a supported cache refresh.
References
- MS-ADTS: schemaUpdateNow
- Microsoft: updating the Active Directory schema cache
- Microsoft: attributeSchema class
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