| Event Id | 1154 |
| Source | Active Directory |
| Description | Class identifier %1 (class name %2) has an invalid relative distinguished name (RDN) attribute identifier %3. Class definition ignored. |
| Event Information | The specified schema class has a relative distinguished name (RDN) attribute identifier that is not valid. The class definition is ignored. Assign a valid RDN attribute identifier to the schema class. |
| Reference Links | Monitoring AD Changes: Article |
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