Server receives error message from node “Unexpected program termination”

[vermillion blue]

Hello,

I regularly use NoMachine to connect from a Mac to our multiple Linux machine’s. However in one of them when I try to log in, the process begins to load but then suddenly crashes with the error msg: “Unexpected program termination.” (see full log below)

I have tried several things including reinstalling (multiple times…) and modifying configuration files, but nothing has worked so far.

I appreciate very much any assistance on this.

Thanks!

Here are some more details:

—

NoMachine Workstation Subscription – Version 8.11.3

Subscription type: WS.

Remote PC OS: Ubuntu 20.04

And here are some of the error messages from nxserver.log:

24134 24134 2024-04-22 23:43:11 087.275 NXSERVER Connected from remote machine using protocol ‘NX’.

Info: Handler started with pid 24134 on Mon Apr 22 23:43:11 2024.

Info: Handling connection from remote machine on Mon Apr 22 23:43:11 2024.

24134 24134 2024-04-22 23:43:11 385.730 NXSERVER User logged in from remote machine using authentication method NX-password.

21904 21904 23:43:13 987.678 Redis: 10 changes in 600 seconds. Saving….

24134 24134 2024-04-22 23:43:15 068.880 NXSERVER ERROR! Received error message from node ‘:’, ‘Unexpected program termination.’.

Info: Connection from remote machine closed on Mon Apr 22 23:43:15 2024.

Info: Handler with pid 24134 terminated on Mon Apr 22 23:43:15 2024.

24134 24134 2024-04-22 23:43:15 122.190 NXSERVER Remote machine disconnected.

24500 24500 2024-04-22 23:43:17 980.075 NXSERVER Connected from remote machine using protocol ‘NX’.

Info: Handler started with pid 24500 on Mon Apr 22 23:43:18 2024.

Info: Handling connection from remote machine on Mon Apr 22 23:43:18 2024.

Info: Connection from remote machine closed on Mon Apr 22 23:43:22 2024.

Info: Handler with pid 24500 terminated on Mon Apr 22 23:43:22 2024.

24500 24500 2024-04-22 23:43:23 021.885 NXSERVER User from remote machine logged out.

24500 24500 2024-04-22 23:43:23 022.669 NXSERVER Remote machine disconnected.

[Britgirl]

Hi,

Take a look at the article which contains a number of things to check why this could be happening:

How to solve ‘session negotiation failed, application terminated prematurely’
https://kb.nomachine.com/AR08N00898

I noticed that you have a Workstation Subscription. You have a direct channel to our support team if you login with your CustID and password in the support section of the website. Logs will be required in order to understand what’s happening.

On the affected machine, enable debug:

sudo /etc/NX/nxserver --debug --enable

reproduce the problem

sudo /etc/NX/nxserver --debug --collect

Please also attach the node.cfg and system logs. All of this can be sent by email to forum[at]nomachine[dot]com. If you prefer to open a ticket, you will get instructions on where to send it.

[Britgirl]

I forgot to mention to attach the userhome/.xsession-errors and system log, as well.

[vermillion blue]

Thank you very much for your help.

Changing the parameter to

DefaultDesktopCommand “/usr/bin/mate-session”

Did solve the problem.

Have a nice day!

[Author]

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