ERROR_DS_SECURITY_ILLEGAL_MODIFY - 8423 (0x20E7)
The modification was not permitted for security reasons.
Updated: Feb 21, 2026
Technical Meaning
The error code ERROR_DS_SECURITY_ILLEGAL_MODIFY (8423, 0x20E7) indicates that a requested modification to an object or resource was denied due to security policies enforced by the system. This error typically arises when the user or process attempting the operation does not have sufficient permissions to perform the specified action.
Error Details
This error is specific to directory service operations, particularly those involving Active Directory (AD) and Lightweight Directory Access Protocol (LDAP). It signifies that a security policy has prevented the modification of an object in the directory structure. The exact nature of the operation can vary but generally involves changes such as modifying attributes or permissions on AD objects.
Usage Context
This error is commonly encountered when performing administrative tasks within Active Directory, where strict access controls are enforced to ensure data integrity and security. It may also appear during operations that require elevated privileges, such as modifying group policies or changing user attributes.
Developer Interpretation
When encountering this error, developers should consider the following aspects:
- Access Control: Verify that the process or user has the necessary permissions to perform the requested operation. Ensure that the security context of the process matches the required access level for the target object.
- Operation Context: Review the specific operation being performed and ensure it aligns with the intended purpose. For example, modifying certain attributes may require different levels of permission than others.
- Security Policies: Check if any security policies or group policies are in place that might restrict the modification of objects. These policies can be configured at various levels, including domain-wide settings and individual object permissions.
Related Errors
ERROR_DS_OBJECT_NOT_FOUND(1932, 0x784): Indicates that the specified object could not be found, which may lead to an illegal modification attempt if the object does not exist.ERROR_DS_NO_ATTRIBUTE_OR_VALUE(1665, 0x671): Suggests that a required attribute or value is missing, potentially leading to an illegal modification if necessary data is incomplete.
FAQ
Q: What causes this error?
A: This error typically occurs when the user or process lacks sufficient permissions to perform the requested operation on an AD object. It can also arise from conflicting security policies that restrict modifications.
Q: How can I resolve this issue?
A: Ensure that the user or process has the necessary permissions and that any relevant security policies are correctly configured. Review the specific operation being performed and verify that it aligns with the required access level.
Summary
The ERROR_DS_SECURITY_ILLEGAL_MODIFY error indicates a security policy violation during an attempted modification of an AD object. Developers should focus on verifying permissions, reviewing operation context, and ensuring compliance with security policies to address this issue effectively.