“No available desktops on this server”

[mjordan]

We have a large deployment of Windows and Mac systems running NoMachine Server.  On the Windows side, it is a mix of Windows Server 2012, Windows Server 2016, and Windows 10.  Various graphics cards (typically integrated graphics or Nvidia cards, various driver versions).  On the Macs I don’t get the issue I’m writing about now.

On any of these Windows stations, occasionally an operator will report that they are unable to access the system via NoMachine.  They can authenticate through the NoMachine client, but then get the message “<No available desktops on this server>”.  We can still RDP into the station and things look fine, as far as I can tell.  I try restarting the NoMachine service but that typically does not fix the issue, and I usually need to reboot the system for it to be fully accessible via NoMachine again.

I don’t immediately see anything in the Windows logs that are obvious red flags.

I realize this is a very broad issue, but where can I start to troubleshoot this?  It’s driving me (and my operators) crazy.

[Britgirl]

Hi,  are you using the latest version of NoMachine software? If not, I recommend you update all machines.

We would need to see the NoMachine logs of the affected Windows host as well. Please take a look at this document for instructions for Windows: https://knowledgebase.nomachine.com/DT11R00181#1.4. Enable debug ‘restart nxserver’ not the machine, connect and if there is still ‘no available’ collect logs and send to us.

Does this problem come up after changes in the user that is opening the desktop?  So multiple “fast user switches”?

EDIT: This issue could possibly be related to the TR we solved in 7.8.2 -> https://knowledgebase.nomachine.com/TR05S10241.

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