Black screen or session negotiation failed

[kttn8769]

Hi,

I’m trying to connect from MacOS 10.14.6 to Ubuntu 18.04.3 but it fails with black screen. NoMachine version is 6.8.1 for the both sides.

Then I “sudo systemctl stop gdm” followed by “sudo /etc/NX/nxserver –restart”, below is the output:

 

NX> 162 Disabled service: nxserver.

NX> 162 Service: nxnode already disabled.

NX> 162 Disabled service: nxd.

NX> 111 New connections to NoMachine server are enabled.

NX> 161 Enabled service: nxserver.

NX> 162 WARNING: Cannot find X servers running on this machine.

NX> 162 WARNING: A new virtual display will be created on demand.

NX> 161 Enabled service: nxd.

 

Then I get “The session negotiation failed. Error: Cannot create a new display, please contact your system administrator.”

 

I would appreciate your help. Thank you.

[og00r]

Could you please gather some logs for us to check this issue?
Article on how to collect logs:

https://www.nomachine.com/DT10O00163 (“How to gather debug logs for support requests”)

Please enable them, restart the nxservice:
‘/etc/NX/nxserver –restart’
And try reproduce problem.
Gather logs then.
After gathering logs, please send them to forum[at]nomachine[dot]com using the title of that forum’s thread as the mail’s subject.

But I must ask why did you stop gdm? Is it on purpose? Because now it will try to create virtual session.

[Author]

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