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I’m evaluating NX for a University Computer Science Department. Most of faculty uses OS X laptops from home, while most of our machines in house are Ubuntu 12.04 and 14.04. I have one user that can’t connect from this laptop (running El Capitan with the newest NM client installed. The logs show :NXWmRunningHelper: WARNING! Failed to open display ‘:0’
Other users connect just fine to the same target machine so I’m thinking he has some artifact from an old NX install or something. He gets the initial desktop screen normally, logs in, and screen changes to a grey/black screen. Our in house systems are using Gnome.
In my relatively short experience, sometimes NX sessions get broken and you get a blank screen. For us that may be the NX server is hosed, or the X server, and we just restart them (that may sound odd but we usually only have one or two users on each “server”). That may not be so palatable for your system with many users working fine.
When your user is NOT connected, do you see any evidence that they still have an active/disconnected session?
e.g. any processes in ‘ps -ef’
and/or any sessions in /usr/NX/bin/nxserver –history
You can generally kill their session with
/usr/NX/bin/nxserver –terminate <username>
and get them to login again.
From the message you’re getting, NXWmRunningHelper: WARNING! Failed to open display ‘:0′, it looks like you’re attempting to connect to the physical display (and not virtual desktop sessions). We are not aware of similar problems. Ideally, we’d need to see the logs of both client and server to be able to understand why this specific user has trouble connecting. Please refer to the article about extracting logs and send them to forum[at]nomachine[dot]com. https://www.nomachine.com/DT07M00098.
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