Title: Message
Started seeing a few of these in the directory services event log on one of our domain controllers:
 
Event Type: Error
Event Source: NTDS Database
Event Category: Internal Processing
Event ID: 1168
Date:  7/24/2003
Time:  9:45:35 AM
User:  N/A
Computer: NTS363
Description:
Error 8430(20ee) has occurred (Internal ID 20612ee).  Please contact Microsoft Product Support Services for assistance.
I called PSS and found that SP4 adds some additional AD database consistency checks. This particular error is caused by orphaned objects in AD. The PSS tech commented that a few of these in the event log should not be cause for concern, but if they start cropping up over and over, then there might be a more serious problem.
 
The fix is to reboot a DC (preferably the one logging the errors) into directory services restore mode, run ntdsutil, and do a semantic check. Details of performing this check can be found at http://support.microsoft.com/?id=814202 (this article has nothing to do with the errors at hand, it just shows how to do the check). If ntdsutil can't fix the errors it finds, it will report the offending objects, which you will then need to (cautiously) delete with ADSIedit.

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