| Event Id | 1523 |
| Source | Active Directory |
| Description | The schema cache load failed to convert the string default SD %1 on class-schema object %2. The error code is %3. The schema cache load will fail. Please check that the default SD on the class is valid. If not- please change the value to a correct one. |
| Event Information | According to Microsoft: EXPLANATION: The Active Directory schema cache load cannot convert the default security descriptor on the specified schema class object. As a result, the schema cache load will fail. USER ACTION: Verify that the default security descriptor on the class is valid. If it is not valid, change it to a correct value. |
| Reference Links | Windows Operating System (Active Directory) |
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