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The message says:
NoMachine Workstation appears to be installed on this host. Two
different NoMachine packages can’t be installed at the same time on
the same host. Be sure you uninstall NoMachine Workstation before
installing NoMachine.This means exactly that. You can’t install a free NoMachine package on top of a Workstation package already installed.
Did you try to update to version 5 using the automatic updates facility?
This topic has come up often in the forums early on and we prepared a number of articles based on these forum posts that answer such questions about what has changed between version 3 and the later NoMachine software, now NoMachine 5.
For example, a good article to start with is:
https://www.nomachine.com/AR11K00745You will read that in version 4 (now version 5) we introduced the “lightweight” mode. The lightweight mode is available in the Linux Workstation and all products providing Linux virtual desktops (so no lightweight mode for the free Linux version that doesn’t have virtual desktops). It works in the same way as NX 3, that is by using the glorious X11 protocol. The responsiveness with legacy X11 applications will be the same as you were accustomed to before. You probably won’t be able to watch Netflix or YouTube, do videoconferencing, play a game, but if you are not interested in doing that, lightweight NX 5 sessions are what you are looking for. I.e the Workstation would be a good starting point.
Download it here: https://www.nomachine.com/download/linux&id=13
This domain issue will be fixed in the next update of NoMachine 5. Here’s the Trouble Report: https://www.nomachine.com/TR08M05944.
Please use the “Notify me” to know when a fix is available.
Everyone, please update to version 5. The TR https://www.nomachine.com/TR07M05813 was fixed in this release.
Try the latest packages of version 5 that we just released and let us know if you’re still having problems. This version has a feature specifically for headless Linux servers https://www.nomachine.com/FR10L02842.
EddieA, you should see something like this once you’ve activated the session menu and clicked Display:
This seems to be a firewall issue. Please check your firewall settings and allow connections for NoMachine’s Network Service nxd, which listens by default on port 4000 (more about ports here: https://www.nomachine.com/AR01L00770).
Please check that the hostname you are using is correct. This error means that the IP address you are trying to connect to is not reachable.
Just a quick note on the fly. NoMachine 5 is now available. Check out the announcement here: https://www.nomachine.com/SU07M00100&sn=
Since we are about to go live with NoMachine 5 (a matter of minutes), why don’t you try this and see if the issue continues. We aren’t aware of on/off problems and disappearing screens, so it has to be investigated further. If it does, submit the logs as recommended.
Are you able to send us the full set of logs? Send them to forum[at]nomachine[dot]com. Please consult the instructions here to learn how to enable and locate them: https://www.nomachine.com/DT04M00076. Make sure you reference your topic in the email or subject.
The free NoMachine package is for access to the physical desktop as I already mentioned. So yes, it’s like VNC for the sake of a simple comparison. The products that are oriented to professionals and organizations provide the functionality (virtual Linux desktop sessions) that you are requesting. To clarify better what you can and can’t do with the free NoMachine product, please take a look at the following FAQ (-https://www.nomachine.com/faq):
What is the difference between physical desktop and virtual desktop?
https://www.nomachine.com/AR10K00700Differences between NoMachine for Linux and NoMachine Workstation for Linux
https://www.nomachine.com/AR10K00702If you’re looking for Linux terminal server functionality, or in the past you were using NX Free Edition, you need to use the Workstation. The download URL is linked directly from the URL I provided in my earlier post.