Event ID 1536 — Schema Extension Validation

Applies To: Windows Server 2008 R2

When a schema change is made, Active Directory Domain Services (AD DS) validates the schema change and rejects the request if any error is found.

Event Details

Product: Windows Operating System
ID: 1536
Source: Microsoft-Windows-ActiveDirectory_DomainService
Version: 6.0
Message: Internal event: AD_TERM schema validation failed while performing an LDAP add or modify operation on the following schema object.

Schema object:

Additional Data
Error value:
%2 %3


Correct the schema extension script, and retry

An inappropriate schema modification was attempted. The change was rejected and not commited to the Active Directory database. This failure does not affect the health of Active Directory Domain Services (AD DS).

If the schema change is necessary, correct the schema extension script, and then attempt to run it again. To learn more about extending the schema, see How to Extend the Schema (http://go.microsoft.com/fwlink/?LinkId=96259).


After a schema extension, check Event Viewer for Event ID 1536. If you find this event after an attempt to extend the schema, the attempt failed. For more information about properly extending the schema, see Creating an Application Directory Partition (http://go.microsoft.com/fwlink/?LinkId=96258).

To verify a valid schema extension by using Event Viewer:

  1. Open Event Viewer. To open Event Viewer, click Start. In Start Search, type eventvwr.msc, and then press ENTER. If the User Account Control dialog box appears, confirm that the action it displays is what you want, and then click Continue.
  2. Expand Applications and Services Logs, and then click Directory Service.
  3. Click Find, type 1536, and then click Find Now. Click Find Next to advance to the next event as necessary.
  4. Confirm that there are no Critical, Error, or Warning events related to the schema that occurred after the schema extension. To locate events that are related to the schema, click Find, type DS Schema, and then click Find Next.

Schema Extension Validation

Active Directory