I have installed tightvnc on my ubuntu 16.04 desktop/server computer. I can ping it, connect using putty ssh. Start the vncserver successfully. From windows 10 pro workstation computer is start TightVNC viewer and enter the IPaddress of the ubuntu computer. I have tried putting VNC port 590x after the IPAddress as 192.168.n.n:Port#. In fact I have tried ever combinations found on internet on how to connect using viewer. This is simple setup. Any help someone can give me would be greatly appreciated.