Thank you Britgirl for your reply. I don’t have this problem with Linux computers on the network/modem, they provide an nx IP address and Port that can be accessed from other computers outside my network. So I feel the modem can be ignored as the cause. The problem therefore must be within the Windows 7 computer setup. I previously used Hamachi on the Win 7 machine, and when NoMachine started, it produced a 192.168.1.8 address and a Hamachi address, but not an nx address. I uninstalled Hamachi and all its data, so now I get only the local address (nx://192.168.1.8). Any ideas?