The pointer highlight feature allows to easily locate the mouse cursor on the screen upon pressing the ctrl key.
When the pointer highlight is enabled on the NoMachine client host, the Control key is not sent to the remote desktop, even if the “Grab the keyboard input” option is enabled in the client settings.
Whichever Ctrl key combination (e.g. ctrl+c) pressed on the user's keyboard will be therefore ineffective in the NoMachine session.
In this case it's necessary to force the NoMachine client using an alternative method to grab the ctrl key. To do that, launch the client from command line with the --activegrab option:
When the setting 'Grab the keyboard input' doesn't catch all keys, use this
option to force a different grabbing mode. The client will catch keys only
when the cursor is inside the window.
For example, on Linux:
We plan to make this option available also in the client configuration file: https://www.nomachine.com/FR05O03411