| Event Id | 1234 |
| Source | Active Directory |
| Description | A logon attempt failed because an attempt to lookup Windows account information failed. Error %1. _ |
| Event Information | This is an Active Directory internal event. Internal events appear in the Event Viewer only when the default logging level is changed. Most internal events are for informational purposes only. This event is logged when a logon attempt fails because an attempt to look up Windows account information fails. No user action is required. |
| Reference Links | Monitoring AD Changes: Article |
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