Black screen or session negotiation failed

Forum / NoMachine for Linux / Black screen or session negotiation failed

Viewing 2 posts - 1 through 2 (of 2 total)
  • Author
  • #24122


    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.


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

Viewing 2 posts - 1 through 2 (of 2 total)

Closed because the user did not provide further feedback. Please notify us if you confirm that it is resolved or open a new topic if you have the same problem.