I’m having the exact problem, situation, just new pc, and laptop, I have new PC in same LAN than my laptop so i disable gateway:
https://forums.nomachine.com/topic/how-can-i-enable-lan-connections-only
Like these, with GUI or use the GUI to edit the service preference and disable the “Gateway port” (see screenshots).
And I don’t change anything else i just go to my client and try to connect, like its in the same LAN, it just appears and I can see in NoMachine interface, I click, I put user and I get the error. I delete cache folder and try again, didn’t work.
I have to delete just cache folder just in the client side right? If yes that solution didn’t work for me
error page: https://www.nomachine.com/TR12K04112