On some of our computers we receive the message:
2013-02-21 14:19:44 I #2548 UpdEvents Generating update event:EventId=2402:Severity=4:ProductId=VIRUSCAN8700:Locale=0000:UpdateType=Hot Fix:UpdateError=-1:NewVersion=9999:DateTime=
And the status monitor says:
Update failed to version HotFix 9999
There's no hotfix 9999 checked in in ePO.
If you have checked in VSE87HF792686 and installation fails, you see this message in the logs. Maybe an issue with patch 5 for VSE8.7 (not installed before etc.).