Hi af85,
In order to understand better why you cannot see the physical session, we will need to see debug logs:
1. Enable debug: sudo /etc/NX/nxserver –debug –enable all
2. Reproduce the problem
3. Collect logs: sudo /etc/NX/nxserver -debug -collect
and send them to us.
4. Disable logs sudo /etc/NX/nxserver -debug -disable all
You can also take look at this article with the detailed instructions: https://knowledgebase.nomachine.com/DT11R00181#1.1. Please send the logs directly to forum[at]nomachine[dot]com making sure to use the topic’s title in the subject.
The desktop environment you are accessing will be useful to know as well. I take it that before you configured screenblanking and screenlocking for the physical session, you were able to see the physical session and connect. In the meantime, you could connect using a virtual session maybe.
If you have an active subscription, you are entitled to open a support ticket.