Hi !
I installed NoMachine free version 5.3 on my laptop and my lab desktop, my laptop has Windows 7 and lab desktop has Ubuntu 16.04. When I want to try to get access to my home laptop through lab desktop remotely it shows error 110 and when I want to get access to my lab desktop through home laptop it shows error 138. I am not sure what exactly the problem is, I searched on forums and most of them says I have to run some kind of debug software to get more info, so can someone help me with that. Also when I took my home laptop to my friends place and tried to get access to my laptop through my lab desktop , it was working but for vice versa it was still not, so I am not sure whether it is wifi router problem or network problem or something else.