Knowledge

ERROR_DS_UNICODEPWD_NOT_IN_QUOTES - 8556 (0x216C)

The unicodePwd attribute value must be enclosed in double quotes.

Updated: Feb 21, 2026

Introduction

This article provides a detailed explanation of the ERROR_DS_UNICODEPWD_NOT_IN_QUOTES error, which is encountered when using the Windows API. The error indicates that the unicodePwd attribute value must be enclosed in double quotes.

Technical Background

The unicodePwd attribute is used to store password values in Active Directory as Unicode strings. This attribute is often utilized by applications and scripts that interact with the directory service through the Windows API, such as LDAP or ADAM (Active Directory Application Mode).

Error Details

Numeric Code: 8556 (0x216C)

The error code ERROR_DS_UNICODEPWD_NOT_IN_QUOTES is a specific return value from the Windows API. It indicates that the unicodePwd attribute value was not properly formatted, specifically missing double quotes around the Unicode string.

Common Causes

The error typically occurs due to one of the following reasons:

  • Invalid Parameter Values: The unicodePwd attribute value was passed without proper formatting (i.e., without double quotes).
  • Incorrect Object Type: The operation was performed on an object that does not support or require the use of the unicodePwd attribute.

Real-World Context

This error is commonly encountered in scenarios where applications are interacting with Active Directory through LDAP operations. For example, when setting a new password for a user account using the ADModify utility or similar tools, it is essential to ensure that the unicodePwd value is correctly formatted.

Is This Error Critical?

The criticality of this error depends on the context in which it occurs. If an application fails due to this error, it may result in a failed password update or other related operations. However, the system itself remains stable and no hardware or kernel-level issues are implied by this error.

How to Diagnose

To diagnose this issue, follow these steps:

  1. Review Operation Context: Ensure that the operation being performed is appropriate for the object type involved.
  2. Validate Parameters: Check the unicodePwd attribute value to ensure it is properly formatted with double quotes around the Unicode string.
  3. Confirm Object Types: Verify that the object supports or requires the use of the unicodePwd attribute.
  4. Verify Input Data: Ensure that all input parameters are correctly formatted and do not contain any syntax errors.

How to Resolve

To resolve this issue, take the following actions:

  1. Correct Parameter Usage: Ensure that the unicodePwd value is properly formatted with double quotes around the Unicode string.
  2. Adjust Operation Context: If necessary, adjust the operation context to ensure it aligns with the requirements of the object type being manipulated.
  3. Restore Data: If data corruption or incorrect formatting was the cause, restore the correct format and retry the operation.

Developer Notes

Developers should be aware that the unicodePwd attribute is sensitive to proper formatting. Ensuring that all API calls involving this attribute are correctly formatted can prevent such errors from occurring.

Related Errors

  • ERROR_DS_NO_ATTRIBUTE_OR_VALUE: This error might occur if the operation attempts to modify an attribute that does not exist or has no value.
  • ERROR_DS_DN_SYNTAX_VIOLATION: This error could be encountered if there is a syntax issue with the distinguished name (DN) used in the operation.

FAQ

Q: What causes ERROR_DS_UNICODEPWD_NOT_IN_QUOTES?

A: The error occurs when the unicodePwd attribute value is not properly formatted, specifically missing double quotes around the Unicode string.

Q: How can I prevent this error from occurring?

A: Ensure that all unicodePwd values are correctly formatted with double quotes around the Unicode string before passing them to API functions.

Summary

The ERROR_DS_UNICODEPWD_NOT_IN_QUOTES error is a specific return value indicating improper formatting of the unicodePwd attribute. By ensuring proper parameter usage and correct formatting, developers can avoid this issue and maintain smooth operation when interacting with Active Directory through the Windows API.