Thanks for the info. That’s reassuring. I found a good LifeWire article that said IPv6 issues can sometimes be caused by the router or modem needing a reboot but that didn’t do it for me, either. How to Fix an IPv6 No Network Access Error (lifewire.com). I’ll have to see what I can come up with to test the current IPv6 functionality of my router “in house” to see, cable network or not, whether the router itself still has its advertised IPv6 functionality. Edit_Update: Looks like the following article might be a good place for me to start - IPv6 Command line Testing & Troubleshooting in Windows (computernetworkingnotes.com)