“No available sessions on this server” on Mac

[CanisLupis]

Starting this morning, I’m seeing “no available sessions on this server” while trying to connect to two different Mac OS machines. Both of the Macs are running Mac OS 10.15.4 and NoMachine 6.9.2. The client machine trying to connect to the Macs is running Windows 10, with NoMachine 6.9.2 installed. NoMachine was working on both of these Mac OS devices yesterday afternoon. For troubleshooting, I’m still able to use SSH to access both machines, and VNC is working on one of them.

The strange thing is that we haven’t made any changes on either of these machines recently which should affect NoMachine. The only change that’s been made to both of them is that one of them updated to Mac OS 10.15.4 a week ago and one of them updated to Mac OS 10.15.4 this morning.

Things that I’ve tried:
Verifying that I am using administrator accounts to try to connect to the Macs
Making sure that “All Desktops” is selected and not just “My Desktops” after connecting to the machine in NoMachine
Restarting each machine.
Restarting all the NoMachine-related processes on both of these machines.
Making sure that there are no DNS conflicts of any type.

Any suggestions for further troubleshooting via SSH?
Has anyone else experienced similar issues with Mac OS 10.15.4?

[og00r]

one of them updated to Mac OS 10.15.4 a week ago

Were you able to connect to that machine after system update, was any pop show up to allow nxnode process?
The latest macOS requires some more permissions, are you able to reinstall manually NoMachine on those machines?
Or is only ssh connection available right now? You can try do it with vnc as ” VNC is working on one of them”
if you don’t have physical access to that machine.

Also could you gather nxserver logs from the remote server so we can see whether the problem is with permissions on
new macOS version or if problem is somewhere else? This article contains information how to do it correctly:
https://www.nomachine.com/DT10O00163 (you can attach them here or send directly to forum[at]nomachine[dot]com).

You can do it through ssh and if possible please run nxserver –restart after enabling logs.

Could you also check if nxnode process (ps -ef | grep nxnode) is running for correct user? (by comparing user id for that process with
logged user / root (if login window is active). Write the output here.

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