After switching network or network interface (for example from WiFi to LAN), NoMachine doesn't detect immediately the change and still shows the old local IP and external IP:port in the Welcome panels. 

In about ten minutes (this is the server's interval for monitoring network changes) NoMachine is able to reconfigure the router for mapping port 4000 to the new external IP address, but information in the Welcome panels is still not updated. 

Users will be able however to connect to the new IP (either public or private), once they know it.