Black screen problem

Forums / NoMachine for Linux / Black screen problem

Tagged: 

Viewing 8 posts - 1 through 8 (of 8 total)
  • Author
    Posts
  • #26030
    Avatarmrosing
    Participant

    Free version 6.9.2 both client and server – physical display – ubuntu 18.04 (both sides) – gnome both sides

    I have tried several ways to attempt to fix a black screen on connection and all have failed.  The first thing I tried was to reload h.264 library codecs on both client and server.  I then edited node.cfg so it could find libGL.so and restarted the server.  Then I found the log files and noticed it could not find libpam.so, so I edited nxexec so it pointed to the right place.  I edited the server.cfg and node.cfg according to https://www.nomachine.com/DT10O00163 but it really didn’t change the log of the error:

    5457 5457 11:31:41 073.074 Process: ERROR! Cannot get information for user id ‘10699’.
    5457 5457 11:31:41 073.089 Process: ERROR! Error is 2, No such file or directory.
    5457 5457 11:31:41 073.092 HostGetUserInfoByUid: WARNING! Failed to get process user information.

    Searching for this error I found this forum.  It is possible all the libraries nx is looking for are one more level deep (in /usr/lib/x86_64-linux-gnu) and I just need to fix something simple.    Any ideas on how to fix this?

    Thanks

    Mike

    #26041
    Avatarkroy
    Contributor

    It is not advisable to make changes to the binary files. Please uninstall, remove NoMachine directories and install again. If problem with black screen shows again – use this tip: https://www.nomachine.com/AR03P00973

    #26048
    Avatarmrosing
    Participant

    I uninstalled and re-installed on both sides and still got black screen.  Then I turned off gdm, and still got a black screen.  There are no errors in the logs on the server side, but the client side shows:

    19176 20295 08:20:14 390.375 ServerNetworkInfoHandler: WARNING! Obtaining network data failed.

    Rebooting to run level 3 via remote vpn is problematic.  Is there a way to capture more verbose info to help debug this?

    Thanks.

    #26057
    Avatarmrosing
    Participant

    We changed to a different computer which is actually headless.  This time I got a set of log files, and the message:

    The session negotiation failed.

    Error: Cannot create a new display, please contact your system administrator

    The log files are attached.

    Hopefully there is a clue on how to make this work.

    #26096
    Avatarmrosing
    Participant

    So the files didn’t make it, but it looks like that doesn’t matter.  I ran nxexec –auth directly and got the following:

    /usr/NX/bin/nxexec –auth
    Username:mrosing
    Please wait…
    Please wait…
    Please wait…
    ERROR: Internal exception.
    4689 4689 08:12:35 228 nxexecPAMCheckCredentials: ERROR!Authentication failed with error 7.
    Login failed.

    There is nothing in the log from this interaction.  How can I turn on debugging to figure out why this is happening?

    Thanks!

    Mike

    #26098
    AvatarBritgirl
    Keymaster

    Can you send any files that didn’t upload to forum[at]nomachine[dot]com? Please put the title of your topic as the subject, thanks!

    #26133
    Avatarmrosing
    Participant

    I put everything back to the original (and latest NoMachine 6.9.2), plugged in a terminal to the box with the black screen, and now it works fine.  This is definitely a user error problem, thank you for the help!

    #26152
    AvatarBritgirl
    Keymaster

    There is also an article in the knowledge base handling this issue:

    How to solve black screen on headless machines
    https://www.nomachine.com/AR03P00973

Viewing 8 posts - 1 through 8 (of 8 total)

You must be logged in to reply to this topic.