Turns out it was the router IP address at the SD-Wan location.    Trying to figure out what is going on, I started disabling WAN interface (I have/had 2 connections at each location; fiber and cable at LAN and fiber and cable at SD-Wan location). After disabling one of the WAN interfaces at the SD-Wan location, I was unable to VPN back in there to continue testing. Looking further, I saw that the SD-Wan VPN tunnel is for some reason connecting to the backup/failover/WAN 2 IP address at the LAN location. I also noticed that the IPv6 status is "failed" for WAN2 at the LAN location. I'm going to try to unplug the LAn WAN2 interface and see what happens.  ... View more