VSS operations may fail on a Windows 7 or Windows Server 2008 R2 system that has the App-V client installed

Applies to: Windows Server 2008 DatacenterWindows Server 2008 EnterpriseWindows Server 2008 R2 Datacenter


You may experience the following issues on a system that has the Application Virtualization (App-V) client installed:

Issue 1

When you run the vssadmin list shadowstorage, vssadmin list volumes or vssadmin list shadows commands, the following error occurs:

Error: The shadow copy provider had an unexpected error while trying to process the specified command.

Issue 2

A physical to virtual (P2V) conversion using System Center Virtual Machine Manager 2008 R2 (SCVMM) fails during ‘Scan System’ with the following error:

VMM does not have appropriate permissions to access the resource on the server.domain.com server.
Ensure that Virtual Machine Manager has the appropriate rights to perform this action.

ID: 2910
Details: Access is denied (0x80070005)

Issue 3

Hyper-V virtual machines that have the App-V client installed will be placed in a “Saved State” during backup operations.

When these issues occur, the following events will be logged in the Application event log:

Log Name:      Application
Source:        VSS
Event ID:      12348
Level:         Warning
Volume Shadow Copy Service warning: VSS was denied access to the root of volume \\?\Volume{edec3633-6714-11e1-823e-001372e3804b}\. Denying administrators from accessing volume roots can cause many unexpected failures, and will prevent VSS from functioning properly.  Check security on the volume, and try the operation again.

Log Name:      Application
Source:        VSS
Event ID:      8193
Volume Shadow Copy Service error: Unexpected error calling routine Error calling CreateFile on volume '\\?\Volume{edec3633-6714-11e1-823e-001372e3804b}\'.  hr = 0x8000ffff, Catastrophic failure

Log Name:      Application
Source:        VSS
Event ID:      12293
Volume Shadow Copy Service error: Error calling a routine on a Shadow Copy Provider {b5946137-7b9f-4925-af80-51abd60b20d5}. Routine details IVssSnapshotProvider::QueryVolumesSupportedForSnapshots(ProviderId,-1,...) [hr = 0x80042302, A Volume Shadow Copy Service component encountered an unexpected error.


The VSS operations fail because VSS doesn’t support the App-V virtual drive which is a non-NTFS volume.


To resolve this issue, install the following hotfix:

2738812 The "vssadmin list shadowstorage" command fails after you install the App-V client on a Windows Server 2008 R2-based computer