a) machine sleep (stand-by) or display sleep. It’s hard to say, not beig able to see the screen but I don’t think the machine slept and I don’t know what the primary screen did but I still had th remnants of the desktop visible in my client.
b) What do you mean when you write ‘nomachine shows it’s dead’. – I can’t remember
c) Fedora 37
d) Does the machine has a physical monitor attached? – yes
e) I am assuming that you mean that you can’t be physically in front of the server every time it happens in order to touch the server’s keyboard? – yes
f) And you confirm that touching the keyboard or moving the mouse in the session window from the client side has no effect whatsoever? – yes