ERROR_DS_NONEXISTENT_POSS_SUP - 8390 (0x20C6)

Introduction

This article provides a detailed technical explanation of the Windows error code ERROR_DS_NONEXISTENT_POSS_SUP with numeric value 8390 and hexadecimal representation 0x20C6. It covers the context, common causes, diagnostic guidance, and resolution strategies for this specific error.

Technical Background

The ERROR_DS_NONEXISTENT_POSS_SUP is a schema update failure error in Active Directory. Schema updates are critical operations that modify the structure of an Active Directory forest or domain, affecting how objects are stored and managed within it. This error indicates that during a schema update, a class referenced in the poss-superiors attribute does not exist.

Error Details

The poss-superiors attribute is used to define the possible superior classes for an object class in Active Directory. When attempting to modify or add a new object class, if the system encounters a reference to a non-existent class within this attribute, it will generate this error.

Common Causes

• Invalid Parameter Values: The schema update operation includes references to non-existent classes in the poss-superiors attribute.
• Incorrect Object Type: The object being updated or added has an incorrect or unsupported type that conflicts with existing schema definitions.
• Exceeding Limits: The number of possible superior classes for a given object class exceeds system-defined limits, leading to a failure during schema update.

Real-World Context

This error typically occurs when performing administrative tasks such as adding new object classes or modifying existing ones in an Active Directory environment. It can also arise from issues with the underlying directory service infrastructure or incorrect configuration of schema definitions.

Is This Error Critical?

The criticality of this error depends on the specific context and impact of the schema update operation. In general, it is a serious issue that requires immediate attention to prevent further disruptions in the Active Directory environment.

How to Diagnose

1. Review Operation Context: Verify the details of the schema update operation, including the object classes involved and their attributes.
2. Validate Parameters: Ensure all parameters used in the schema update are correct and valid according to the current schema definitions.
3. Confirm Object Types: Check that the object types being updated or added align with existing schema definitions.
4. Verify Input Data: Validate that there are no inconsistencies or missing references within the poss-superiors attribute of affected classes.
5. Check Limits or Constraints: Ensure that the number of possible superior classes for a given class does not exceed system-defined limits.

How to Resolve

1. Correct Parameter Usage: Update any invalid parameter values and ensure all references in the schema update are correct.
2. Adjust Operation Context: Modify the operation context if necessary, ensuring it aligns with the current schema definitions.
3. Restore Data: If data corruption is suspected, restore from a backup or use tools to repair the affected schema entries.
4. Retry Operation with Valid Inputs: Attempt the schema update again using validated and correct input parameters.

Developer Notes

Developers should be aware of the potential for this error when working with Active Directory schema updates. Proper validation of object classes, attributes, and their relationships is crucial to avoid such issues.

Related Errors

• ERROR_DS_SCHEMA_MISMATCH
• ERROR_DS_ATTRIBUTE_OR_VALUE_EXISTS
• ERROR_DS_OBJECT_CLASS_NOT_DEFINED

FAQ

Q: What does the error ERROR_DS_NONEXISTENT_POSS_SUP mean?

A: This error indicates that a schema update operation encountered a reference to a non-existent class in the poss-superiors attribute.

Q: How can I prevent this error from occurring?

A: Ensure all parameters and references used in schema updates are correct and valid according to current schema definitions. Regularly validate object types and their relationships within the Active Directory environment.

Summary

The ERROR_DS_NONEXISTENT_POSS_SUP is a specific error related to schema update failures in Active Directory, indicating that a non-existent class was referenced in the poss-superiors attribute. Understanding its causes and implementing appropriate diagnostic and resolution strategies can help maintain the integrity and functionality of an Active Directory environment.