I’m seeing the same…
Tested with two new KVM guests, both running a “vanilla” Fedora 40 KDE spin (that is Wayland only) I get:
The session negotiation failed
Error: Cannot create a new display, please contact your system administrator
This is NoMachine 8.13.1. In the connection logs I see, in “session”
4474 4474 2024-09-07 09:27:14 597.341 ClientSession: Failing reason is ‘The session negotiation failed.
Error: Cannot create a new display, please contact your system administrator’.
and:
libEGL warning: egl: failed to create dri2 screen
and then in “connection”:
NX> 105 Listsession –status=”disconnected\054connected” –type=”all” –shadowable=”yes”
NX> 149 Confirmation required for creating new frame buffer on server
Startxserver –option=”yes”
NX> 500 ERROR: Cannot create a new display, please contact your system administrator.
I see there’s a bug https://kb.nomachine.com/TR05V11141, flagged due to be solved in 8.x. I wonder if there’s any hope of progress here as Fedora releases that include X with soon be dropping out of support.