| Event Id | 1168 |
| Source | NTDS Database |
| Description | Error -1507(fffffa1d) has occurred (Internal ID 202022d). Please contact Microsoft Product Support Services for assistance. |
| Event Information | The "XXXX" string in the first event ID 1168 message refers to column identifiers that are missing in the Active Directory database. For more information about this problem, click the link given below. |
| Reference Links | SP2 Hotfixes Recommended Before Making Schema Changes in Active Directory Forests Random 1168 Event Messages Are Logged After You Install Windows 2000 Service Pack 4 |
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