- Veeam Support Knowledge Base
- 0x8004230F or Error: VSSControl: -2147212529 (VSS_E_UNEXPECTED_PROVIDER_ERROR)
0x8004230F or Error: VSSControl: -2147212529 (VSS_E_UNEXPECTED_PROVIDER_ERROR)
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Challenge
A job fails with the error:
Failed to prepare guest for hot backup.
Error: VSSControl: -2147212529
Backup job failed.
Discovery phase failed.
Cannot add volumes to the snapshot set.
Cannot add a volume to the snapshot set.
Volume name: [\\?\Volume{<guid>}\].
Cannot add volume to the set of volumes that should be shadowed.
VSS error: VSS_E_UNEXPECTED_PROVIDER_ERROR. Code:0x8004230f
Cause
This error occurs when there is third-party VSS provider present with the machine that is being processed.
During the Application-Aware Processing stage of the Veeam backup job a shadow copy is requested. The Volume Shadow Copy service of the machine being processed handles the creation of that shadow copy. When a third-party provider is present, that provider may fail to create the shadow copy and cause the shadow copy creation process to fail.
To learn more about how the Volume Shadow Copy service operates, review Microsoft Documentation: Volume Shadow Copy Service.
Solution
- Connect to the machine that failed to be processed.
- Open an elevated command prompt.
- Execute the following command to view the list of installed VSS Providers:
vssadmin list providers
It is critical that the following services must have their "Startup Type" set to "Manual"
- Microsoft Software Shadow Copy Provider
- Volume Shadow Copy
More Information
VSS Provider Location in Registry
A list of installed VSS Providers can be found in the following Registry Key:
HKLM\SYSTEM\CurrentControlSet\Services\VSS\Providers\
Known Issue: Hyper-V VM Migrated to vSphere
The issue described in this article has been observed when a Hyper-V VM was converted or restored to a VMware environment. Afterward, the now VMware VM still contains the Hyper-V IC Software Shadow Copy Provider, which may cause the VSS_E_UNEXPECTED_PROVIDER_ERROR error. When facing this scenario, customers reported that the error no longer occurred after removing the Hyper-V IC Software Shadow Copy Provider provider.
Customer Reported VSS Providers That Impacted Veeam
The following is a non-exhaustive list of VSS providers that Veeam customers have reported had to be removed to resolve the issue described in this article:
- Data ONTAP VSS Hardware Provider
- Acronis VSS SW Provider
- Symantec Software VSS Provider
- StorageCraft Volume Snapshot Software Provider
- Backup Exec VSS Provider
- Dell EqualLogic VSS HW Provider
- Nimble Storage VSS Provider
- Azure Site Recovery VSS Provider
- VSS LifeLine HW Provider
- HP MSA 1040/2040 VSS Provider
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