On one of my servers, Windows 2008 R2 + SP1 x64, there is an eror logged in the application's log from time to time.
Log Name: Application
Date: 18-8-2012 20:02:11
Event ID: 8193
Task Category: None
Volume Shadow Copy Service error: Unexpected error calling routine ConvertStringSidToSid(S-1-5-21-1194966028-1128717823-2729922094-1642.bak). hr = 0x80070539, The security ID structure is invalid.
Everything looks fine using VSSadmin. I searchedthe registy for S-1-5-21-1194966028-1128717823-2729922094-1642.bak. I found it and deleted it. The error still comes back in the log.
The error always occurs between 8:00pm and 2:00am, and not every day.
Any suggestions on how to fix this? Or could I just ignore the error?