Event ID - 15484

Event Id15484
SourceMSSQLServer
DescriptionCould not revoke login access from %s.
Event InformationAccording To Microsoft:
Cause:

sp_revokelogin removes the login entries from Microsoft SQL Server for a Microsoft Windows NT user or group created with sp_grantlogin or sp_denylogin. sp_revokelogin has failed to delete the login entries from the sysxlogins table and the specified user or group still has the same grant or deny status as before the command was executed.

Resolution:
Try the command again. If the command still fails, use SQL Profiler to see exactly where the failure is occurring and if there are additional errors that show up in the SQL Profiler trace.
Reference LinksMicrosoft product: SQL Server Version: 2000.80.760.0 Event Source: MSSQLServer Event ID: 15484

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