Do not allow COM port redirection

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.

Additional Information

  1. Registry path is:

    HKEY_LOCAL_MACHINE -> SOFTWARE -> Policies -> Microsoft -> Windows NT -> Terminal Services # fDisableCcm

  2. The Administrative Template path is:

    Windows Components -> Remote Desktop Services -> Remote Desktop Session Host -> Device and Resource Redirection


* Making mistakes while changing registry values can affect your system adversely. We recommend you to create a System Restore point before making registry manipulation. If you're new to Registry Editor, read this beginner's guide.
** To locate the registry and administrative template path, checkout beginner's guide.
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