Hello,
What to do depends on the NoMachine product you have installed.
If you use NoMachine free version or Enterprise Desktop the login window is always visible.
If you don’t see it, please check in the client application that you have selected “All desktops” instead of “My desktops”.
If you have selected “All desktops” and still can’t see sessions please send logs to: forum[at]nomachine[dot]com.
Full instructions about collecting logs: https://www.nomachine.com/DT10O00163#1.3.
On the other hand, if you are using any of the other products from the NoMachine for Enterprise range, access to physical display is not enabled by default.
For NoMachine Cloud Server, the user must be administrator or trusted to get access to login window.
To make user trusted for physical desktop please use command:
nxserver –useradd <username> –trusted physical
To make user administrator please use command:
nxserver –useradd <username> –administrator
If you have any of the Terminal Server products installed, you can use the same solution as for Cloud Server or change server configuration key
‘PhysicalDesktopSharing’ value to 1
Please check also key ‘LoginScreenAccess’ (default value is 1) if have a default value.
If these suggestions doesn’t help, please collect and send logs (as per previous link above).