ERROR_DS_STRING_SD_CONVERSION_FAILED - 8522 (0x214A)
The schema cache load failed to convert the string default SD on a class-schema object.
Updated: Feb 21, 2026
Technical Meaning
The error code ERROR_DS_STRING_SD_CONVERSION_FAILED with the numeric value 8522 and hexadecimal representation 0x214A indicates a failure in converting the string default security descriptor (SD) on a class-schema object during schema cache loading.
Error Details
This error typically occurs when the Active Directory Schema Cache is being loaded, and it encounters an issue with the security descriptor associated with a particular class definition. The security descriptor is crucial for defining access control settings for objects within the directory service.
Usage Context
This error can be encountered during operations that involve loading or modifying the schema cache in an Active Directory environment. It may also appear when attempting to initialize or update the schema information stored in the directory service.
Developer Interpretation
When this error is returned, it suggests that there was a problem with the security descriptor string associated with a class-schema object during the schema cache load process. The developer should ensure that the security descriptor provided for the class-schema object is correctly formatted and adheres to the expected syntax and structure.
Related Errors
ERROR_DS_DN_SYNTAX_VIOLATION(1972)ERROR_DS_ATT_SCHEMA_REQVAL_MISMATCH(3058)ERROR_DS_ATT_SCHEMA_NO_NAME(3064)
FAQ
Q: What does the error mean?
A: The schema cache load failed to convert a string default security descriptor on a class-schema object.
Q: How can I resolve this issue?
A: Ensure that the security descriptor provided for the class-schema object is correctly formatted and adheres to the expected syntax and structure. Review the input data and correct any issues before retrying the operation.
Summary
The ERROR_DS_STRING_SD_CONVERSION_FAILED error indicates a failure in converting the string default security descriptor on a class-schema object during schema cache loading. Developers should ensure that the provided security descriptors are correctly formatted to avoid this issue.