OK found the solution or more like the problem!
Must have gone loco or lack of sleep!
What I was doing makes no sense at all. In a hurry, I was unplugging the cable from the ROUTER and plugging it into the card plug!!! So now my J720 was connected to my PC!
When I realized what a F$%ing dumb thing I was doing, I connected the cable from the card plug to the router box and hey, go figure.... it worked first time!!!
Better get some sleep.