Red Cloud "Try to reconnect" and nothing happens,

There were two others. But up until I noticed 1Passwords issues, I had thought each was an isolated item. But once I had all 3 and confirmed that I could run my macbook off the same ethernet line without any of the issues (well... 2 of them) that pretty much confirmed that it was a network setup issue on the Windows 11 Pro machine.

The first was Microsoft Flight Simulator 2020 would not finish loading at startup. The progress bar would get to a certain point and just hang. This happened pretty much 99% of the time. The only sure fire way around it was to disconnect the network cable. Then it would finish loading in, but you'd be without network features.

The other, was the speedtest.net website. (as well as some, but not all other similar bandwidth test sites) The site loaded, but the speed test wouldn't be able to show the upload speed. Download, ping, latency were all fine. Even for up. But the upload speed was zero.

I had found someplace buried on a speedtest thread about iPv6 being the issue and to turn it off. And now it works.

While I'm very experienced on computers, I've been a professional VFX animator for years, I'm not a programmer and I don't know much on networking. I have no clue what iPv6 is compared to iPv4. Or if this is going to hurt me someplace else in the future. So far, everything is running fine.