Here is an unusual case that might come up for a few. I set up an HA box in my home network. THen moved it to another network where I use an openvpn tunnel to access it, but the reverse proxy is still on my network. So guess what…what HA thinks is the reverse proxy is actually is the IP of the other end of the tunnel. I guess that’s not surprising but I had to go to the logs like the OP to see the IP and then quickly realized it was the tunnel IP. THere you have it!