Policy

Do not allow COM port redirection

Windows 11 25H2

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Policy overview

Key metadata and intent for this policy.

ClassComputer
CategoryWindows Components > Remote Desktop Services > Remote Desktop Session Host > Device and Resource Redirection
Supported onAt least Windows Server 2003 operating systems or Windows XP Professional

Supported OS tags: Windows10, Windows10RT, Windows11, Windows7, Windows8, Windows81, WindowsRT, WindowsRT81, WindowsServer2003, WindowsServer2008, WindowsServer2012, WindowsServer2012R2, WindowsServer2016, WindowsVista, WindowsXP

This policy setting specifies whether to prevent the redirection of data to client COM ports from the remote computer in a Remote Desktop Services session. You can use this setting to prevent users from redirecting data to COM port peripherals or mapping local COM ports while they are logged on to a Remote Desktop Services session. By default, Remote Desktop Services allows this COM port redirection. If you enable this policy setting, users cannot redirect server data to the local COM port. If you disable this policy setting, Remote Desktop Services always allows COM port redirection. If you do not configure this policy setting, COM port redirection is not specified at the Group Policy level.

Internal name
TS_CLIENT_COM
Policy ID
ad1cb9c89420
Elements
0

Registry values

How enabled and disabled states update the registry.

Registry locationTypeEnabled valueDisabled value
HKLM\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services\fDisableCcmREG_DWORD
1
0

Policy elements

Inputs and configuration options exposed by this policy.

This policy has no additional user input fields.

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