Knowledge

ERROR_DS_INVALID_DMD - 8360 (0x20A8)

The schema object could not be found.

Updated: Feb 21, 2026

Technical Background

ERROR_DS_INVALID_DMD is a specific error code in the Windows Active Directory domain, indicating that an operation failed due to an invalid directory management descriptor (DMD) object. DMD objects are used to define and manage schema extensions within the Active Directory environment.

Error Details

The ERROR_DS_INVALID_DMD error typically occurs when a request is made for a DMD object that does not exist in the Active Directory schema. This can happen during operations such as adding, modifying, or querying DMD objects.

Common Causes

  • Invalid Object Type: The operation was attempted on an object that is not a valid DMD.
  • Object Not Found: The specified DMD object does not exist in the Active Directory schema.
  • Incorrect Usage Context: The operation context did not match the requirements for the DMD object.

Real-World Context

This error can occur during various administrative tasks, such as managing schema extensions or troubleshooting issues related to directory management. It is important to ensure that all operations are performed within the correct context and with valid parameters.

Is This Error Critical?

The criticality of this error depends on the specific operation being performed. If a DMD object is required for an operation, its absence can prevent the operation from completing successfully. However, in some cases, the operation may still proceed if alternative methods are available or if the missing DMD does not impact the overall functionality.

How to Diagnose

  1. Review Operation Context: Ensure that the operation being performed is appropriate for the context and environment.
  2. Validate Parameters: Check that all parameters used in the operation are correct and valid.
  3. Confirm Object Types: Verify that the object types involved in the operation match the expected DMD objects.

How to Resolve

  1. Correct Parameter Usage: Ensure that all parameters, including those related to DMD objects, are correctly specified.
  2. Adjust Operation Context: If necessary, adjust the context or environment of the operation to ensure compatibility with the required DMD objects.
  3. Restore Data: If a DMD object is missing due to corruption or deletion, restore it from backup or reapply any necessary schema extensions.

Developer Notes

Developers should be aware that this error can occur during operations involving Active Directory schema management and should handle such errors appropriately in their applications. Proper validation of input parameters and context checks can help prevent this error.

Related Errors

  • ERROR_DS_DMD_EXISTS: Indicates that a DMD object already exists.
  • ERROR_DS_DMD_NOT_FOUND: Similar to ERROR_DS_INVALID_DMD, but specifically indicates that the requested DMD does not exist.

FAQ

Q: What is a DMD object?

A: A DMD (Directory Management Descriptor) object in Active Directory is used to define and manage schema extensions. It contains information about new attributes, classes, or other schema elements.

Q: How can I prevent this error from occurring?

A: Ensure that all operations involving DMD objects are performed with correct parameters and context. Validate input data and check for the existence of required DMD objects before performing critical operations.

Summary

ERROR_DS_INVALID_DMD is a specific Active Directory error indicating an invalid DMD object was requested or used in an operation. Proper validation and context checks can help prevent this error, ensuring smooth management of schema extensions within the Active Directory environment.