Allow or Disallow use of encryption to protect the RPC protocol messages between File Share Shadow Copy Provider running on application server and File Share Shadow Copy Agent running on the file servers.

Verified with Windows 11 25H2 — updated on July 30, 2026

Supported on: At least Windows Server 2012, Windows 8 or Windows RT

Path in the GPO console

Computer Configuration\Administrative Templates\System\File Share Shadow Copy Provider

Description

Determines whether the RPC protocol messagese used by VSS for SMB2 File Shares feature is enabled. VSS for SMB2 File Shares feature enables VSS aware backup applications to perform application consistent backup and restore of VSS aware applications storing data on SMB2 File Shares. By default, the RPC protocol message between File Server VSS provider and File Server VSS Agent is signed but not encrypted. Note: To make changes to this setting effective, you must restart Volume Shadow Copy (VSS) Service .

Registry

HKLM Software\Policies\Microsoft\Windows\fssProv

Value name: EncryptProtocol

Enabled: EncryptProtocol = 1

Disabled: EncryptProtocol = 0

MDM / Intune (CSP)

./Device/Vendor/MSFT/Policy/Config/ADMX_FileServerVSSProvider/Pol_EncryptProtocol

Device Since Windows 10, version 2004 with KB5005101 [10.0.19041.1202] and later | Windows 10, version 20H2 with KB5005101 [10.0.19042.1202] and later | Windows 10, version 21H1 with KB5005101 [10.0.19043.1202] and later | Windows 11, version 21H2 [10.0.22000] and later Official mapping (Microsoft Learn)

Microsoft Learn documentation Mapping data: Microsoft Learn (CC BY 4.0)

Export Builder

BETA

Configure the state, scope and options, then generate .reg, PowerShell, Intune and SCCM outputs — or add the setting to a multi-setting collection.

These exports write the registry — this is not a managed GPO. ⓘ

Not configured Enabled Disabled

.reg file

Windows Registry Editor Version 5.00

; Exported from gporais.com
; Policy: Allow or Disallow use of encryption to protect the RPC protocol messages between File Share Shadow Copy Provider running on application server and File Share Shadow Copy Agent running on the file servers.
; State: Enabled
; Supported on: At least Windows Server 2012, Windows 8 or Windows RT

[HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\fssProv]
"EncryptProtocol"=dword:00000001

More formats (PowerShell, Intune, SCCM)

PowerShell

# Exported from gporais.com
# Policy: Allow or Disallow use of encryption to protect the RPC protocol messages between File Share Shadow Copy Provider running on application server and File Share Shadow Copy Agent running on the file servers.
# State: Enabled
# Supported on: At least Windows Server 2012, Windows 8 or Windows RT

$path = 'HKLM:\Software\Policies\Microsoft\Windows\fssProv'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'EncryptProtocol' -Value 1 -Type DWord

Intune XML

OMA-URI: ./Device/Vendor/MSFT/Policy/Config/ADMX_FileServerVSSProvider/Pol_EncryptProtocol
Data type: String
Value:
<enabled/>

Intune Remediation

# === Detection script ===
# Exported from gporais.com
# Policy: Allow or Disallow use of encryption to protect the RPC protocol messages between File Share Shadow Copy Provider running on application server and File Share Shadow Copy Agent running on the file servers.
# State: Enabled
# Supported on: At least Windows Server 2012, Windows 8 or Windows RT

function Test-RegistryValue {
  param(
    [Parameter(Mandatory = $true)][string]$Path,
    [Parameter(Mandatory = $true)][string]$Name,
    [object]$Expected,
    [ValidateSet('String', 'DWord', 'MultiString')][string]$Kind = 'String',
    [switch]$Absent
  )

  try {
    $item = Get-ItemProperty -LiteralPath $Path -Name $Name -ErrorAction Stop
  } catch {
    return $Absent.IsPresent
  }

  if ($Absent.IsPresent) { return $false }
  $actual = $item.$Name

  if ($Kind -eq 'DWord') { return ([int64]$actual) -eq ([int64]$Expected) }
  if ($Kind -eq 'MultiString') {
    $actualValues = @($actual)
    $expectedValues = @($Expected)
    if ($actualValues.Count -ne $expectedValues.Count) { return $false }
    for ($i = 0; $i -lt $expectedValues.Count; $i++) {
      if ([string]$actualValues[$i] -ne [string]$expectedValues[$i]) { return $false }
    }
    return $true
  }

  return [string]$actual -eq [string]$Expected
}

$checks = @(
  (Test-RegistryValue -Path 'HKLM:\Software\Policies\Microsoft\Windows\fssProv' -Name 'EncryptProtocol' -Expected 1 -Kind DWord)
)

if ($checks -notcontains $false) {
  Write-Output 'Compliant'
  exit 0
}

Write-Output 'Non-compliant'
exit 1

# === Remediation script ===
# Exported from gporais.com
# Policy: Allow or Disallow use of encryption to protect the RPC protocol messages between File Share Shadow Copy Provider running on application server and File Share Shadow Copy Agent running on the file servers.
# State: Enabled
# Supported on: At least Windows Server 2012, Windows 8 or Windows RT

$path = 'HKLM:\Software\Policies\Microsoft\Windows\fssProv'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'EncryptProtocol' -Value 1 -Type DWord

SCCM scripts

# Exported from gporais.com
# Policy: Allow or Disallow use of encryption to protect the RPC protocol messages between File Share Shadow Copy Provider running on application server and File Share Shadow Copy Agent running on the file servers.
# State: Enabled
# Supported on: At least Windows Server 2012, Windows 8 or Windows RT
# SCCM Configuration Item guidance:
# Create a Configuration Item of type "Setting: Script".
# Discovery script: use the Detection script below.
# Remediation script: use the Remediation script below.
# Compliance rule: the Discovery script output equals 'Compliant'.

# === Detection script ===
# Exported from gporais.com
# Policy: Allow or Disallow use of encryption to protect the RPC protocol messages between File Share Shadow Copy Provider running on application server and File Share Shadow Copy Agent running on the file servers.
# State: Enabled
# Supported on: At least Windows Server 2012, Windows 8 or Windows RT

function Test-RegistryValue {
  param(
    [Parameter(Mandatory = $true)][string]$Path,
    [Parameter(Mandatory = $true)][string]$Name,
    [object]$Expected,
    [ValidateSet('String', 'DWord', 'MultiString')][string]$Kind = 'String',
    [switch]$Absent
  )

  try {
    $item = Get-ItemProperty -LiteralPath $Path -Name $Name -ErrorAction Stop
  } catch {
    return $Absent.IsPresent
  }

  if ($Absent.IsPresent) { return $false }
  $actual = $item.$Name

  if ($Kind -eq 'DWord') { return ([int64]$actual) -eq ([int64]$Expected) }
  if ($Kind -eq 'MultiString') {
    $actualValues = @($actual)
    $expectedValues = @($Expected)
    if ($actualValues.Count -ne $expectedValues.Count) { return $false }
    for ($i = 0; $i -lt $expectedValues.Count; $i++) {
      if ([string]$actualValues[$i] -ne [string]$expectedValues[$i]) { return $false }
    }
    return $true
  }

  return [string]$actual -eq [string]$Expected
}

$checks = @(
  (Test-RegistryValue -Path 'HKLM:\Software\Policies\Microsoft\Windows\fssProv' -Name 'EncryptProtocol' -Expected 1 -Kind DWord)
)

if ($checks -notcontains $false) {
  Write-Output 'Compliant'
  exit 0
}

Write-Output 'Non-compliant'
exit 1

# === Remediation script ===
# Exported from gporais.com
# Policy: Allow or Disallow use of encryption to protect the RPC protocol messages between File Share Shadow Copy Provider running on application server and File Share Shadow Copy Agent running on the file servers.
# State: Enabled
# Supported on: At least Windows Server 2012, Windows 8 or Windows RT

$path = 'HKLM:\Software\Policies\Microsoft\Windows\fssProv'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'EncryptProtocol' -Value 1 -Type DWord

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