Client hardware access
Verified with Citrix Workspace App 26.3.10 — updated on July 10, 2026
Supported on: All Citrix Workspace supported platforms
Path in the GPO console
Computer Configuration\Administrative Templates\Citrix Components\Citrix Workspace\Remoting client devices Description
Use this policy to specify maximum number of serial ports supported by the client platform. Also, use this policy to enable and restrict the remote application or desktop's access to the client’s serial, USB, and parallel ports. This allows the server to use locally attached hardware. Troubleshooting: Remote PDA synchronization uses "virtual COM ports". These are serial port connections that are routed through USB connections. It is necessary to enable serial port access to use PDA synchronization for this reason.
Registry
HKLM
Software\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Virtual Channels\Serial Port This policy sets several registry values:
COMAllowed Enabled:
COMAllowed = (not defined) Disabled:
COMAllowed = false VirtualCOMPortEmulation Enabled:
VirtualCOMPortEmulation = (not defined) Disabled:
VirtualCOMPortEmulation = false CPMAllowed Enabled:
CPMAllowed = (not defined) Disabled:
CPMAllowed = false Export Builder
BETAConfigure 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. ⓘ
.reg file
Windows Registry Editor Version 5.00
; Exported from gporais.com
; Policy: Client hardware access
; State: Enabled
; Supported on: All Citrix Workspace supported platforms
[HKEY_LOCAL_MACHINE\Software\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Virtual Channels\Serial Port]
; "COMAllowed" = (not defined)
; "VirtualCOMPortEmulation" = (not defined)
; "CPMAllowed" = (not defined)
"MaxPort"=""
"COMAllowed"=dword:00000001
"VirtualCOMPortEmulation"=dword:00000001
"CPMAllowed"=dword:00000001More formats (PowerShell, Intune, SCCM)
PowerShell
# Exported from gporais.com
# Policy: Client hardware access
# State: Enabled
# Supported on: All Citrix Workspace supported platforms
$path = 'HKLM:\Software\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Virtual Channels\Serial Port'
New-Item -Path $path -Force | Out-Null
# COMAllowed = (not defined)
# VirtualCOMPortEmulation = (not defined)
# CPMAllowed = (not defined)
Set-ItemProperty -Path $path -Name 'MaxPort' -Value '' -Type String
Set-ItemProperty -Path $path -Name 'COMAllowed' -Value 1 -Type DWord
Set-ItemProperty -Path $path -Name 'VirtualCOMPortEmulation' -Value 1 -Type DWord
Set-ItemProperty -Path $path -Name 'CPMAllowed' -Value 1 -Type DWordIntune XML
No direct Policy CSP / OMA-URI mapping for this policy. Use the Intune Remediation tab, or ingest the ADMX in Intune.Intune Remediation
# === Detection script ===
# Exported from gporais.com
# Policy: Client hardware access
# State: Enabled
# Supported on: All Citrix Workspace supported platforms
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
}
# HKLM:\Software\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Virtual Channels\Serial Port\COMAllowed: COMAllowed= is not representable as a registry value.
# HKLM:\Software\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Virtual Channels\Serial Port\VirtualCOMPortEmulation: VirtualCOMPortEmulation= is not representable as a registry value.
# HKLM:\Software\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Virtual Channels\Serial Port\CPMAllowed: CPMAllowed= is not representable as a registry value.
$checks = @(
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Virtual Channels\Serial Port' -Name 'MaxPort' -Expected '' -Kind String)
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Virtual Channels\Serial Port' -Name 'COMAllowed' -Expected 1 -Kind DWord)
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Virtual Channels\Serial Port' -Name 'VirtualCOMPortEmulation' -Expected 1 -Kind DWord)
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Virtual Channels\Serial Port' -Name 'CPMAllowed' -Expected 1 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Client hardware access
# State: Enabled
# Supported on: All Citrix Workspace supported platforms
$path = 'HKLM:\Software\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Virtual Channels\Serial Port'
New-Item -Path $path -Force | Out-Null
# COMAllowed = (not defined)
# VirtualCOMPortEmulation = (not defined)
# CPMAllowed = (not defined)
Set-ItemProperty -Path $path -Name 'MaxPort' -Value '' -Type String
Set-ItemProperty -Path $path -Name 'COMAllowed' -Value 1 -Type DWord
Set-ItemProperty -Path $path -Name 'VirtualCOMPortEmulation' -Value 1 -Type DWord
Set-ItemProperty -Path $path -Name 'CPMAllowed' -Value 1 -Type DWordSCCM scripts
# Exported from gporais.com
# Policy: Client hardware access
# State: Enabled
# Supported on: All Citrix Workspace supported platforms
# 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: Client hardware access
# State: Enabled
# Supported on: All Citrix Workspace supported platforms
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
}
# HKLM:\Software\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Virtual Channels\Serial Port\COMAllowed: COMAllowed= is not representable as a registry value.
# HKLM:\Software\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Virtual Channels\Serial Port\VirtualCOMPortEmulation: VirtualCOMPortEmulation= is not representable as a registry value.
# HKLM:\Software\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Virtual Channels\Serial Port\CPMAllowed: CPMAllowed= is not representable as a registry value.
$checks = @(
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Virtual Channels\Serial Port' -Name 'MaxPort' -Expected '' -Kind String)
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Virtual Channels\Serial Port' -Name 'COMAllowed' -Expected 1 -Kind DWord)
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Virtual Channels\Serial Port' -Name 'VirtualCOMPortEmulation' -Expected 1 -Kind DWord)
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Virtual Channels\Serial Port' -Name 'CPMAllowed' -Expected 1 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Client hardware access
# State: Enabled
# Supported on: All Citrix Workspace supported platforms
$path = 'HKLM:\Software\Policies\Citrix\ICA Client\Engine\Lockdown Profiles\All Regions\Lockdown\Virtual Channels\Serial Port'
New-Item -Path $path -Force | Out-Null
# COMAllowed = (not defined)
# VirtualCOMPortEmulation = (not defined)
# CPMAllowed = (not defined)
Set-ItemProperty -Path $path -Name 'MaxPort' -Value '' -Type String
Set-ItemProperty -Path $path -Name 'COMAllowed' -Value 1 -Type DWord
Set-ItemProperty -Path $path -Name 'VirtualCOMPortEmulation' -Value 1 -Type DWord
Set-ItemProperty -Path $path -Name 'CPMAllowed' -Value 1 -Type DWordBuilding a multi-setting collection? Add this setting and generate combined .reg / PowerShell / GPO scripts.