The logs show ‘A connection timeout has occurred while trying to connect to ‘192.168.1.250’ on port ‘4000’. The issue could either be caused by a networking problem, by a firewall or NAT blocking incoming traffic or by a wrong server address. Please verify your configuration and try again.’.
That indicates a problem with your router, it could be a double NAT for example, or you have not enabled port forwarding correctly. Please take a look at the instructions here:
How to connect over the internet to NoMachine behind a NAT router
https://kb.nomachine.com/AR04S01122
The need for network configuration when using NoMachine to access remote computers over the Internet will be removed when we release NoMachine Network in version 9 (coming soon). You can read more about this feature here: https://www.nomachine.com/network.