Volume shadow copy service error: unexpected error calling routine convertstringsidtosid

Hi, this is Michael Koeppl again. I’m through the Premier Mission Critical (PMC) Team and assisting customers once they hit OS concerns in their critical facilities, and also today I wanted to talk via you around an interesting Windows Back-up concern I encountered.

You watching: Volume shadow copy service error: unexpected error calling routine convertstringsidtosid

My customer realized that his System State Backups (https://technet.microsoft.com/en-us/library/cc938537.aspx) on among his DCs quit working and also asked if I can have a look.

In the Application Event Log was a influential VSS error saying something about a ConvertStringSidToSid attribute which failed.


Here’s the original message for much better searchability:

Log Name: Application Source: VSS Date: 27.06.2017 21:00:21 Event ID: 8193 Task Category: None Level: Error Keywords: Classic User: N/A Computer: MYcomputer.anydoprimary.net

Operation: OnIdentify occasion Gathering Writer Data

Context: Execution Context: Shadow Copy Optimization Writer Writer Class Id: 4dc3bdd4-ab48-4d07-adb0-3bee2926fd7f Writer Name: Shadow Copy Optimization Writer Writer Instance ID: 74a61a33-665e-4041-b325-726825b2bf8e

This was followed by a 521 Event from Windows Backup telling you that the Backup operation failed.

See more: Powerpoint Display On Second Monitor S, Microsoft Powerpoint



The hint was currently in the event details from the VSS error:

Can you spot the SID with the BAK extension at the end?

So we looked at the ProfileList regessential on that machine.

HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows NTCurrentVersionProfileList

And right here it is:


We complied with this KB (947215) and eventually removed the Profile via the BAK expansion and started one more Windows SystemState Back-up, which flourished without any type of errors.

The User Profile Service failed the logon. User profile cannot be loadedhttp://assistance.microsoft.com/kb/947215/en-us

Here’s an automated means to clean up the old prorecords from that list.

See more: Firefox Open Link In New Tab Automatically, Open Link In New Tab

Script to deal with problems defined in KB947215 (PowerShell)


Hope you delighted in the quick excursion from VSS to profiles through an easy solution at the end.



Updated: January 29th, 2019 by Brandon Wilson