Installing NX and logging in with system credentials works out of the box. Changing the cfg files original settings should be done provided you understand what you are changing and why.
In its default installation EnablePasswordDB in the server.cfg is set to ‘0’ which means we do not use our password db, but use the system authentication method.
You edited the server.cfg using Windows tools, and in doing so (for which we have opened the following feature request by the way https://www.nomachine.com/FR05R03981) nxserver lost its ability to read the server.cfg properly and so NX password db became enabled and you user could no longer login using system credentials.
Something good came out of it. We discovered that Windows editors misbehave when editing unix files, so we will improve the software to make sure this doesn’t happen 🙂
Is there a logic to that? That NoMachine has a problem with headless machines? Also if I add a GPU to my system instead of using an onboard (i)GPU, would the GPU still do the work without a monitor or TV connected? Or the TV on standby? Or is that the X-server thing you’re talking about?
No, NoMachine doesn’t have a a problem with headless machines. The logic is rather simple: if there is no monitor attached, the GPU can’t function. It’s not NoMachine that isn’t working. You can consider purchasing a dummy dongle. This will make your system think there is a monitor attached and the GPU will function correctly. Then NoMachine will use HW encoding. Search these forums for the word “dummy dongle” and you will see other users who did the same.