Hi,
Well after futzing for several hours trying various combinations of settings and tweaks.....
I accomplished my goal, and got the XBOX Live to run OPEN.
I had done some reading at other sites and went back to what I had done with my son's old XBOX1 to get it online.
Instead of running Windows ICS from the HTPS and cabling it to the XBOX360, I undid the ICS setup and after rebooting, I set up a Network Bridge between the HTPC and the 360. The downside of this configuration is that it tends to muck up the HTPC's ability to get on the internet, so I had to set up a secondary wireless connection to the HTPC for it's internet access.
I regret that its a bit of a kludge, but its the configuration I need to use for the time being. I might migrate to a HomePlug setup down the road, but for now, this dog will hunt....
SD1