NoMachine Support

Your questions answered

Blanking the host screen during remote control

Protect sensitive data by blanking the host display during a remote control session. This is particularly useful for unattended remote computers to prevent others from entering data or viewing the monitor while you are remotely accessing it. NoMachine's remote screen locking feature is designed to address this need.

How to enable screen blanking

  • To lock the remote screen, select 'Connections status' via the !M icon (the "NoMachine Monitor") in your computer's application tray.

Select 'Show the Connection status' in the Monitor
Fig. 1 – Select 'Show the Connections status' in the Monitor

  • In NoMachine Connections Status click 'Connection preferences' (Fig. 2).

Go to NoMachine Connection Status and select Connection preferences
Fig. 2 – NoMachine Connections Status > Connection preferences

  • Select the 'Security' tab and make sure the box is checked for 'Lock the physical screen when somebody connects' (Fig. 3).You can turn this feature on or off at any time. By default, it is disabled. You will need to provide the administrator's username and password in order to enable it or disable it.

To blank the screen on the remote NoMachine computer, check the box 'Lock the physical screen when somebody connects'
Fig. 3 – Check the box 'Lock the physical screen when somebody connects'

Locking keyboard and mouse input

  • Turning it on also locks the host keyboard and mouse to prevent anyone sitting at the host machine from entering input data during a remote control session.
  • Anyone at the host device sees a blank screen on the physical monitor while the remote session is active.
  • That's it! Once you're done, upon disconnecting the screen will become visible again.