Interactive Troubleshooter

Published: Sep 22, 2026

VSS Shadow Copy Error 0x80042306: Writer Diagnostic

Time: 15 mins Level: Beginner

By StepDiag Engineering Team

Reviewed by Ibraheem Taofeeq Opeyemi

Volume Shadow Copy Service (VSS) error 0x80042306 (VSS_E_PROVIDER_VETO) occurs when a shadow copy provider or writer encounters a critical failure during freeze/thaw operations, storage allocation, or COM+ registration. This diagnostic guide resolves root causes including unresponsive VSS writers, storage limits, third-party provider conflicts, and corrupted COM+ catalog structures.

Full Diagnostic Tree & Step-by-Step Overview

Where is error 0x80042306 occurring or what primary symptom is triggered during backup execution?

vssadmin list writers displays one or more writers in [7] Failed or [9] FailedAfterFreeze state
Backup fails immediately with Shadow Storage limit reached or insufficient diff area space
Conflict caused by third-party backup software or duplicate VSS Hardware/Software Providers
System Event Log shows VSS Event ID 12289/12293 or COM+ Registration / Access Denied errors

Which specific VSS writer or service subsystem is reporting a failed status?

System Writer, NTDS, or WMI Writer in state [7] Failed or [8] FailedInPrepare
Microsoft Exchange Writer or SQL Server Writer in state [9] FailedAfterFreeze or TimedOut
Hyper-V VM IC Writer or ASR Writer fails during snapshot freeze sequence
All VSS Writers show 'State: [1] Stable', but backup job still throws 0x80042306 (VSS_E_PROVIDER_VETO)

Fixing System, NTDS, and WMI VSS Writer Failures

Solution:

Root Cause: System Writer Permission Corruption or Timed-Out State

Error 0x80042306 (VSS_E_PROVIDER_VETO) occurs when the Microsoft System Writer, WMI Writer, or NTDS Writer returns a veto during the PrepareForSnapshot or Freeze phase. This is frequently caused by invalid Access Control Lists (ACLs) on system files in %windir%\winsxs and %windir%\registration, or unhandled file locks held by security software during state enumeration.

# Diagnostic Verification:

Open PowerShell or Command Prompt as Administrator and run:

vssadmin list writers

Check for System Writer or WMI Writer. If state shows [7] Failed or [8] FailedInPrepare with Last Error Timed out or Non-retryable error, this root cause is confirmed.

Check Event Viewer -> Windows Logs -> Application for Event ID 8193 or 12289 from source VSS.

# Step-by-Step Fix:

1. Restart Dependent Core VSS Services:

Open administrative PowerShell and run:

powershell
     net stop vss
     net stop swprv
     net stop cryptsvc
     net start cryptsvc
     net start swprv
     net start vss

2. Fix ACL Permissions on WinSxS and System State Directories:

Run the following commands in elevated Command Prompt to restore default ownership and permissions required by the System Writer:

cmd
     Takeown /f %windir%\winsxs\filemaps\* /a
     icacls %windir%\winsxs\filemaps\* /grant "NT AUTHORITY\SYSTEM:(F)"
     icacls %windir%\winsxs\filemaps\* /grant "NT AUTHORITY\LOCAL SERVICE:(R)"
     icacls %windir%\winsxs\filemaps\* /grant "BUILTIN\Administrators:(F)"

3. Verify Writer Status:

Execute vssadmin list writers and ensure System Writer displays State: [1] Stable and Last error: No error.

# Prevention & Long-Term Monitoring:

Ensure endpoint protection engines exclude %windir%\winsxs\filemaps from aggressive real-time file scanning.

Monitor Microsoft Official Support Guide for VSS service hotfixes and updates.

Resolving Database VSS Writer (SQL/Exchange) Snapshot Timeout

Solution:

Root Cause: Database I/O Hold Freeze Timeout (10-Second VSS Constraint)

The Volume Shadow Copy Service enforces a strict 10-second freeze window for database writers (such as SQL Server Writer or Microsoft Exchange Writer). During this window, database I/O is held in memory while the storage provider creates the copy-on-write snapshot. If disk I/O latency spikes or transaction logs fail to flush within 10 seconds, the writer vetoes the snapshot with error 0x80042306.

# Diagnostic Verification:

Run vssadmin list writers and check the SqlServerWriter or Microsoft Exchange Writer entry.

Look for State: [9] FailedAfterFreeze or Last error: Timed out.

In Windows Event Viewer, filter Application Log for Event ID 8229 (VSS) or Event ID 1 Redo/Flush timed out from SQLWriter.

# Step-by-Step Fix:

1. Restart the Application VSS Writer Service:

For SQL Server: Run net stop SQLWriter followed by net start SQLWriter in elevated Command Prompt.

For Exchange: Run Restart-Service MSExchangeIS in PowerShell (Note: Brief mail store pause).

2. Adjust VSS Freeze Timeout in Registry (if severe I/O load occurs during backup):

Open regedit.exe and navigate to:

HKLM\SYSTEM\CurrentControlSet\Services\VSS\Settings

Create or modify DWORD IdleTimeout and set value to 30000 (decimal, 30 seconds).

3. Optimize Storage and Truncate Logs:

Run database consistency checks (DBCC CHECKDB for SQL) to ensure no corrupted transaction logs are delaying flushing operations.

Ensure backup software uses VSS Full Backup instead of Copy Backup if log truncation is intended.

# Prevention & Long-Term Monitoring:

Stagger database backup schedules so heavy disk backup jobs do not overlap with scheduled database maintenance tasks or heavy user workloads.

Resolving Hyper-V VM IC Writer Snapshot Failures

Solution:

Root Cause: Guest OS Integration Component Mismatch or VSS State Corruption

When backing up Hyper-V virtual machines from the host, the host VSS engine coordinates with the Hyper-V Volume Shadow Copy Requestor service inside the guest OS via Integration Services. If the guest OS VSS writers are in a failed state, or if saved state snapshots cannot be allocated due to missing guest integration components, the host VSS provider aborts with error 0x80042306.

# Diagnostic Verification:

On the Hyper-V Host, run vssadmin list writers and locate Hyper-V IC Writer.

Look for status State: [7] Failed or check Hyper-V-VMMS Admin Event Logs (Event ID 10102, 10104, or 16010).

# Step-by-Step Fix:

1. Reset Guest OS Integration VSS Service:

Log into the Guest Virtual Machine.

Open PowerShell as Admin and run:

powershell
     Get-Service vmicvss | Restart-Service -Force
     vssadmin list writers

2. Verify VM Configuration on Hyper-V Host:

Open Hyper-V Manager -> Select VM -> Settings -> Management -> Integration Services.

Ensure Backup (volume shadow copy) is enabled.

3. Clear Stale Snapshot References in Host Hyper-V VMMS:

Run net stop vmms and net start vmms on the Hyper-V Host.

Retry host-level backup task.

# Prevention & Long-Term Monitoring:

Keep Hyper-V Integration Components up to date across all guest virtual machines.

Ensure guest VMs have sufficient free disk space on all mounted virtual hard disks (VHDX) for guest-level shadow copy allocation.

Resolving Global VSS Provider Veto when All Writers Report Stable

Solution:

Root Cause: Silent VSS Provider Veto or Orphaned Shadow Copies

When vssadmin list writers shows all writers in [1] Stable state, but the backup application still fails with 0x80042306 (VSS_E_PROVIDER_VETO), the root cause is typically an orphaned shadow copy lock, a hidden volume mount-point conflict, or a silent veto from a third-party kernel-mode storage driver during volume freeze.

# Diagnostic Verification:

Run vssadmin list shadows to display all existing shadow copies on the system.

Run vssadmin list providers to verify if multiple VSS providers are active.

# Step-by-Step Fix:

1. Delete Orphaned Shadow Copies:

Open administrative Command Prompt and execute:

cmd
     vssadmin delete shadows /all /quiet

2. Force VSS Service Environment Reset:

Stop the core VSS services and clear stale temporary snapshot state files:

cmd
     net stop vss
     net stop swprv
     vssadmin delete shadows /for=C: /oldest
     net start vss

3. Test Shadow Copy Creation via Native Utility:

Test native creation using wmic or diskshadow:

cmd
     wmic shadowcopy call create Volume="C:\"

If ReturnValue = 0, native VSS snapshotting is functional, pointing to backup software configuration issues.

# Prevention & Long-Term Monitoring:

Automate periodic cleanup of stale shadow copies via scheduled tasks using vssadmin delete shadows during off-peak maintenance windows.

What specific Shadow Storage allocation or space symptom is encountered?

Maximum shadow storage space limit reached or set too low on source volume
Shadow storage association missing or pointing to an invalid/offline storage drive
NTFS cluster size mismatched (e.g. 64KB allocation unit size) causing VSS allocation failure
Disk space critically low (< 10% or < 1GB free) on system drive during snapshot creation

Expanding VSS Shadow Storage Limits and Diff Area Allocation

Solution:

Root Cause: Exceeded Maximum Shadow Storage Allocation

During snapshot creation, VSS uses a copy-on-write mechanism that writes differential block updates to designated Diff Area storage. If the maximum storage limit defined for a volume (MaxSpace) is less than the active volume change rate during the backup window, the VSS Software Provider aborts with 0x80042306.

# Diagnostic Verification:

Run vssadmin list shadowstorage in administrative Command Prompt.

Check Used Shadow Copy Storage space, Allocated Shadow Copy Storage space, and Maximum Shadow Copy Storage space.

If Used equals Maximum, storage space exhaustion is confirmed.

# Step-by-Step Fix:

1. Query Current Storage Limits:

Run: vssadmin list shadowstorage /for=C:

2. Resize Shadow Storage Maximum Limit:

Increase storage limit to 15% or set to UNBOUNDED:

cmd
     vssadmin resize shadowstorage /for=C: /on=C: /maxsize=20%

Or for unlimited allocation:

cmd
     vssadmin resize shadowstorage /for=C: /on=C: /maxsize=unbounded

3. Verify Allocation Settings:

Run vssadmin list shadowstorage and confirm the Maximum parameter has updated.

# Prevention & Long-Term Monitoring:

Maintain at least 15–20% free unallocated space on all production volumes protected by VSS shadow copies.

Re-creating Shadow Storage Associations on Target Volumes

Solution:

Root Cause: Missing or Broken Shadow Storage Volume Association

If the shadow storage association for a source volume points to a target volume that was disconnected, re-lettered, or converted, VSS returns error 0x80042306 because it cannot initialize the diff area file (System Volume Information\{GUID}).

# Diagnostic Verification:

Run vssadmin list shadowstorage.

If no association is listed for a drive being backed up (e.g. For volume: (D:)), or if the target drive letter displays as missing/invalid, the association is broken.

# Step-by-Step Fix:

1. Remove Stale Associations (if present):

Open Command Prompt as Administrator and run:

cmd
     vssadmin delete shadowstorage /for=D: /on=D:

2. Add Fresh Storage Association:

Re-add association pointing the volume to itself (or a designated secondary volume):

cmd
     vssadmin add shadowstorage /for=D: /on=D: /maxsize=15%

3. Test Shadow Copy Initialization:

Execute vssadmin create shadow /for=D: and confirm snapshot generation completes without provider veto.

# Prevention & Long-Term Monitoring:

Avoid changing storage volume drive letters or disk IDs on volumes with active VSS shadow copy protection schedules.

Fixing NTFS Cluster Size and VSS Diff Area Block Mismatches

Solution:

Root Cause: NTFS Allocation Unit Size Incompatibility

The native Microsoft VSS Software Provider (swprv.dll) requires the NTFS allocation unit (cluster size) to be 4KB (4096 bytes) or greater, up to 64KB depending on Windows build. Volumes formatted with non-standard sector parameters or damaged filesystem structures fail during differential block allocation, raising error 0x80042306.

# Diagnostic Verification:

Open PowerShell as Administrator and execute:

Get-Volume | Select-Object DriveLetter, FileSystemLabel, AllocationUnitSize

If AllocationUnitSize is less than 4096, VSS snapshot allocation will fail.

# Step-by-Step Fix:

1. Check File System Integrity:

Run chkdsk C: /f /r in elevated Command Prompt to rule out filesystem structural corruption.

2. Reformat Volume to Standard 4KB Cluster Size (for non-system data volumes):

Backup all data from the target volume.

Format target volume with standard 4096-byte clusters:

cmd
     format E: /FS:NTFS /A:4096 /Q

3. Re-enable Shadow Storage:

Re-add shadow storage association using vssadmin add shadowstorage /for=E: /on=E: /maxsize=10%.

# Prevention & Long-Term Monitoring:

Always ensure new storage drives and SAN volumes are formatted with standard 4KB or 64KB allocation unit sizes when provisioning backup targets.

Resolving Critical Disk Space Exhaustion During Snapshot Creation

Solution:

Root Cause: Insufficient Physical Disk Space for Copy-on-Write Operations

Even if VSS Shadow Storage max size is configured to UNBOUNDED, the underlying physical disk volume requires a minimum threshold of free unallocated space (typically at least 320 MB to 1 GB minimum, or 10% of volume size) to write initial NTFS bitmap pointers and snapshot diff files. If physical space is depleted, the provider vetoes snapshot creation.

# Diagnostic Verification:

Check drive space via PowerShell:

Get-PSDrive -PSProvider FileSystem

Check if Free (GB) on the target volume is below 1 GB or under 10% total capacity.

# Step-by-Step Fix:

1. Clear Temporary Files and Windows Update Cache:

Run administrative PowerShell:

powershell
     Stop-Service wuauserv
     Remove-Item -Path $env:windir\SoftwareDistribution\Download\* -Recurse -Force
     Start-Service wuauserv

2. Delete Old VSS Snapshots to Reclaim Physical Space:

Run vssadmin delete shadows /for=C: /oldest repeatedly until sufficient disk space is reclaimed.

3. Run Disk Cleanup Utility:

Execute cleanmgr /sageset:1 followed by cleanmgr /sagerun:1.

# Prevention & Long-Term Monitoring:

Set up automated disk space alerts (e.g., via SCOM, Datto, or PowerShell monitoring scripts) to notify administrators when volume free space drops below 15%.

What third-party software or provider state is observed on the server?

Multiple VSS Hardware/Software Providers registered (e.g., Acronis, Veeam, StorageCraft, SAN provider)
Old/uninstalled backup application left orphaned VSS Provider registry keys behind
Antivirus / Endpoint Security filter driver blocking raw disk access during snapshot freeze
VSS Snapshot fails over network shares or SMB 3.0 file shares (Remote VSS Provider error)

Managing Third-Party VSS Provider Conflicts and Priority

Solution:

Root Cause: Third-Party VSS Hardware/Software Provider Conflict

When multiple third-party VSS providers (e.g., storage vendor SAN providers, Veeam, Acronis, or StorageCraft) are registered on the same system, they intercept snapshot creation calls ahead of the native Microsoft Software Shadow Copy provider 1.0. If a third-party provider fails to process the snapshot request, it returns error 0x80042306 (VSS_E_PROVIDER_VETO) and prevents fallback to the default Microsoft provider.

# Diagnostic Verification:

Open Command Prompt as Administrator and execute:

vssadmin list providers

If more than one provider is listed (e.g., non-Microsoft entries), a provider conflict is likely.

# Step-by-Step Fix:

1. Identify Registered Providers:

Note the Provider Name and GUID from vssadmin list providers.

2. Force Backup Application to Use Native Microsoft Provider:

In your backup software settings (e.g., Veeam, Backup Exec), select option: Use System VSS Provider or Disable Hardware VSS Provider.

3. Unregister Conflicting Third-Party Provider (if tool is no longer in use):

Open regedit.exe and navigate to:

HKLM\SYSTEM\CurrentControlSet\Services\VSS\Providers

Export key for backup (File -> Export).

Delete the GUID subkey corresponding to the obsolete third-party provider (Do NOT delete {b5946137-7b9f-4925-af80-51abd60b20d5}, which is the native Microsoft System Provider).

4. Restart VSS Service:

Run net stop vss && net start vss.

# Prevention & Long-Term Monitoring:

Cleanly uninstall deprecated backup software agents before installing new backup or imaging solutions.

Removing Orphaned VSS Provider Registry Keys

Solution:

Root Cause: Orphaned VSS Provider DLL References in Registry

When third-party backup products are uninstalled or updated improperly, their registered COM components and VSS provider registry entries frequently remain in the Windows Registry. When VSS enumerates system providers during a snapshot, it attempts to load non-existent DLL files, leading to immediate provider veto errors (0x80042306).

# Diagnostic Verification:

Run vssadmin list providers in elevated Command Prompt.

Open Event Viewer -> Application Log -> Look for Event ID 22 or 8193 citing missing DLL paths under HKLM\SYSTEM\CurrentControlSet\Services\VSS\Providers.

# Step-by-Step Fix:

1. Open Registry Editor (regedit.exe) as Administrator.
2. Navigate to the VSS Providers Key:
HKLM\SYSTEM\CurrentControlSet\Services\VSS\Providers
3. Verify Provider Subkeys:

Standard default Microsoft Provider GUID: {b5946137-7b9f-4925-af80-51abd60b20d5}.

If other GUID keys exist, inspect the CLSID and CLSID\CLSID_Value expanded string values.

Verify if the referenced .dll file path exists on disk.

4. Remove Invalid Provider Subkey:

Right-click the orphaned GUID key -> Delete.

5. Restart VSS and SwPrv Services:

Execute net stop swprv && net start swprv in Command Prompt.

# Prevention & Long-Term Monitoring:

Verify registry cleanliness after performing backup software version migrations or vendor changes.

Excluding VSS Services from Antivirus Filter Drivers

Solution:

Root Cause: Endpoint Protection File Filter Interception

Antivirus and Endpoint Detection & Response (EDR) agents install file system minifilter drivers (fltmc) that monitor I/O requests. During a VSS snapshot, the filesystem freezes write operations briefly. If an antivirus filter driver locks the Volume Shadow Copy storage directory (System Volume Information) or blocks vssvc.exe raw sector access, the snapshot operation times out and fails with veto 0x80042306.

# Diagnostic Verification:

Open Command Prompt as Administrator and run fltmc filters to view loaded minifilter drivers.

Temporarily disable real-time protection; if backup succeeds, filter driver interference is confirmed.

# Step-by-Step Fix:

1. Configure Antivirus Path Exclusions:

Add the following directory paths to your antivirus / EDR exclusion policies:

%windir%\System32\vssvc.exe

%windir%\System32\swprv.exe

X:\System Volume Information\* (for all protected drive letters)

2. Exclude VSS Process Execution:

Add process exclusions for vssvc.exe, swprv.exe, and spoolsv.exe.

3. Verify Minifilter Driver Status:

Run fltmc instances to ensure filter drivers are not attached to \Device\HarddiskVolumeShadowCopy targets.

# Prevention & Long-Term Monitoring:

Follow vendor-recommended antivirus exclusion lists for Windows Server infrastructure roles and VSS-based backup agents.

Fixing Remote VSS Agent and SMB 3.0 Snapshot Vetoes

Solution:

Root Cause: Remote VSS (File Share Shadow Copy) Service Protocol Failure

When backing up Hyper-V virtual machines or application data stored on remote SMB 3.0 file shares, the backup client communicates with the remote server using the File Server Remote VSS Protocol (FSRVP). If the File Server VSS Agent Service (fssagent) on the remote file server is disabled, unauthenticated, or blocked by Windows Firewall, the remote provider vetoes the snapshot with error 0x80042306.

# Diagnostic Verification:

On the remote SMB server, open PowerShell as Administrator and execute:

Get-Service fssagent

Check Event Viewer -> Application and Services Logs -> Microsoft -> Windows -> FileServerVSSAgent -> Operational for Event ID 8 or 10.

# Step-by-Step Fix:

1. Enable File Server VSS Agent Service on Remote Storage Server:

Run in elevated PowerShell on SMB file server:

powershell
     Set-Service fssagent -StartupType Automatic
     Start-Service fssagent

2. Configure Firewall Rules for Remote VSS Protocol:

Enable File Server Remote VSS Agent firewall group:

powershell
     Enable-NetFirewallRule -DisplayGroup "File Server Remote VSS Agent"

3. Verify Backup Account Permissions:

Ensure the service account running the backup job is a member of the local Backup Operators or Administrators group on the remote file server.

# Prevention & Long-Term Monitoring:

Test remote VSS capability periodically using diskshadow script targeting remote UNC paths.

What registry, DLL, or COM+ error code is displayed in Event Viewer?

VSS Event ID 8193 or 12289: Unexpected error calling routine CoCreateInstance / COM+ failure
Core VSS DLL files unregistered or corrupted following system upgrade
Access Denied (0x80070005) error during VSS Service initialization
Pending reboot or Windows Update servicing stack lock blocking VSS driver

Repairing COM+ Catalog and VSS CoCreateInstance Failures

Solution:

Root Cause: COM+ Catalog Corruption or Class Registration Failure

The Volume Shadow Copy Service uses Component Object Model (COM+) infra to invoke writer interfaces. Event ID 8193 with error CoCreateInstance(CLSID_VSSCoordinator) indicates that the COM+ catalog (%windir%\Registration) is corrupted or permissions on the COM+ infrastructure are blocking vssvc.exe from instantiating writer classes.

# Diagnostic Verification:

Event Viewer -> Application Log contains Event ID 8193:

Volume Shadow Copy Service error: Unexpected error calling routine CoCreateInstance. hr = 0x80040154, Class not registered.

# Step-by-Step Fix:

1. Re-register COM+ and VSS Binary Components:

Open Administrative Command Prompt and run:

cmd
     cd /d %windir%\system32
     net stop vss
     net stop swprv
     regsvr32.exe /s ole32.dll
     regsvr32.exe /s oleaut32.dll
     regsvr32.exe /s vss_ps.dll
     vssvc.exe /Register
     regsvr32.exe /s clbcatq.dll
     net start swprv
     net start vss

2. Rebuild COM+ Catalog (if errors persist):

Rename corrupted COM+ catalog log directory:

cmd
     net stop msdtc
     msdtc -uninstall
     msdtc -install
     net start msdtc

3. Verify Writer Status:

Execute vssadmin list writers to confirm normal operational status.

# Prevention & Long-Term Monitoring:

Create system restore points before applying major third-party schema modifications to COM+ infrastructure.

Full Re-registration of VSS System DLL Files

Solution:

Root Cause: Unregistered or Desynchronized VSS Core DLL Libraries

During OS feature updates or aggressive malware remediation, dynamic link libraries (.dll) responsible for VSS execution (vss_ps.dll, swprv.dll, vssui.dll) can become unregistered or desynchronized in the Windows Side-by-Side (WinSxS) assembly cache.

# Diagnostic Verification:

Running vssadmin list writers or vssadmin list providers outputs blank lists or returns Error: 0x80042306 immediately.

# Step-by-Step Fix:

1. Execute Full VSS DLL Registration Script:

Open PowerShell as Administrator and run the following script block:

powershell
     Set-Location $env:windir\system32
     net stop vss
     net stop swprv
     $dlls = @("ole32.dll", "oleaut32.dll", "vss_ps.dll", "swprv.dll", "vssui.dll", "swprv.dll", "eventcls.dll", "es.dll", "stdprov.dll", "vssvc.exe", "msxml.dll", "msxml3.dll", "msxml6.dll")
     foreach ($dll in $dlls) {
         regsvr32.exe /s $dll
     }
     vssvc /Register
     net start swprv
     net start vss

2. Run Component Store Cleanup:

Scan and repair core system binaries using DISM and System File Checker:

powershell
     DISM.exe /Online /Cleanup-Image /RestoreHealth
     sfc /scannow

3. Restart Computer:

Reboot the system to complete DLL assembly initialization.

# Prevention & Long-Term Monitoring:

Run sfc /scannow regularly following unexpected system crashes or hard power downs.

Resolving Access Denied (0x80070005) VSS Initialization Errors

Solution:

Root Cause: Insufficient DCOM Permissions or Local Service Rights

The VSS Service executes under the NT AUTHORITY\LocalService or NetworkService security account. If DCOM (Distributed Component Object Model) launch permissions or Registry key permissions under HKLM\SYSTEM\CurrentControlSet\Services\VSS\Diag restrict access to these system accounts, VSS fails during initialization with Access Denied and code 0x80042306.

# Diagnostic Verification:

Event Viewer logs show VSS Event ID 8193 with hr = 0x80070005, Access is denied.

# Step-by-Step Fix:

1. Configure DCOM Launch and Activation Permissions:

Press Win + R, type dcomcnfg.exe, and press Enter.

Navigate to: Component Services -> Computers -> My Computer.

Right-click My Computer -> Properties -> COM Security tab.

Under Launch and Activation Permissions, click Edit Default.

Ensure Network Service, Local Service, and SYSTEM are present and have Local Launch and Local Activation set to Allow.

2. Fix Registry Permissions for VSS Diagnostics:

Open regedit.exe as Administrator.

Navigate to: HKLM\SYSTEM\CurrentControlSet\Services\VSS\Diag.

Right-click Diag -> Permissions -> Click Add -> Add NT AUTHORITY\Local Service -> Grant Full Control.

3. Restart Services:

Run net stop vss && net start vss in Command Prompt.

# Prevention & Long-Term Monitoring:

Avoid modifying default DCOM security settings via domain Group Policy Objects (GPO) without explicit auditing of backup service requirements.

Clearing Pending Reboot and Servicing Stack Lockouts

Solution:

Root Cause: Servicing Stack Lock and Pending Installation Reboot

When Windows Update or role installations stage component updates in the TrustedInstaller pipeline, kernel file locks are placed on key storage drivers and VSS system binaries until the host is rebooted. Subsequent snapshot operations are vetoed by the VSS coordinator with error 0x80042306 until the servicing transaction finishes.

# Diagnostic Verification:

Inspect Registry for pending reboot keys under:

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Component Based Servicing\RebootPending

Or check System Event Log for pending installation notices from TrustedInstaller.

# Step-by-Step Fix:

1. Check for Pending Reboot Status in PowerShell:

Run administrative PowerShell:

powershell
     Get-ItemProperty -Path 'HKLM:\SYSTEM\CurrentControlSet\Control\Session Manager' -Name PendingFileRenameOperations -ErrorAction SilentlyContinue

2. Complete Windows Servicing Tasks:

Save all open work and execute system restart:

powershell
     Restart-Computer -Force

3. Post-Reboot Verification:

After reboot, verify VSS functionality:

cmd
     vssadmin list writers

Ensure all writers report State: [1] Stable and Last error: No error.

# Prevention & Long-Term Monitoring:

Schedule server reboots promptly following scheduled Windows Update patch deployment cycles.

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