1452 - Warning: Failed to read security descriptor for file ... (Access is denied)

Symptom

The following error message is seen when a file is in use and therefore being handled by VSS.

Warning: 21:47:05 Failed to read security descriptor for file: C:\Program Files\Computers\
Diagnostics\ServiceHost_20100620192402.xml, reason: \\?\GLOBALROOT\Device\
HarddiskVolumeShadowCopy191\Program Files\Computers\Diagnostics\
ServiceHost_20100620192402.xml (Access is denied)

Cause

This error occurs when the Redstor service does not have permission to access the original file and is  therefore attempting to access the snapshot copy.

Solution

To resolve this, ensure that Redstor has read access to all files that you wish to back up. You will need to grant Redstor service administrator permissions, as described in Article 1432.