Reply To: Error is 138:Connection timed out

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Right now routers supporting UPnP or NAT-PMP are configured automatically to pass connections to NoMachine and all required information is displayed at initial screen (Welcome to NoMachine).

Routers not supporting UPnP or NAT-PMP and Firewalls have to be configured manually to pass traffic to port 4000 (NX protocol), 22 (SSH protocol on Linux/MacOSX) or (4022) (SSH protocol on Windows).

Additionally, your NAT service is running on Virtual Box which means that it cannot be configured automatically with help of UPnP or NAT-PMP. To do it manually please refer to: