Knowledge

ERROR_DS_NCNAME_MUST_BE_NC - 8357 (0x20A5)

The object must be a naming context.

Updated: Feb 21, 2026

Technical Meaning

The error code ERROR_DS_NCNAME_MUST_BE_NC (8357, 0x20A5) indicates that a naming context object is required for the operation being performed. A naming context in the context of Active Directory refers to a container or partition within the directory structure where objects are organized and managed.

Error Details

This error typically occurs when an API call expects a naming context but receives another type of object, such as a domain name or a distinguished name that does not represent a valid naming context. The operation may fail because it requires a specific type of container to function correctly.

Usage Context

The ERROR_DS_NCNAME_MUST_BE_NC error is commonly encountered in scenarios involving Active Directory operations, particularly those related to directory partition management or object organization within the AD structure. It can also appear when working with Lightweight Directory Access Protocol (LDAP) queries that require a naming context.

Developer Interpretation

Developers should interpret this error as an indication that the provided object is not suitable for the operation being performed. The API call expects a naming context, which is a specific type of container in Active Directory. Developers must ensure that the correct type of object is passed to the function or method.

Related Errors

  • ERROR_DS_OBJECT_IS_GROUP (8352, 0x20A0): The object is a group.
  • ERROR_DS_OBJECT_IS_USER (8353, 0x20A1): The object is a user.
  • ERROR_DS_OBJECT_CLASS_VIOLATION (8046, 0x1F9E): The object class does not match the expected type.

FAQ

Q: What causes this error?

This error occurs when an operation expects a naming context but receives another type of object. Common causes include passing a domain name or distinguished name that is not a valid naming context to an API call.

Q: How can I resolve this issue?

Ensure that the correct type of object (a naming context) is passed to the function or method. Verify that the operation context and parameters are correctly set up for the specific Active Directory operation being performed.

Summary

The ERROR_DS_NCNAME_MUST_BE_NC error indicates that a naming context is required but not provided. Developers should ensure that they pass the correct type of object to API calls related to Active Directory operations.