The issue I am facing:
I have received this error approximately once per day after updating to v6:
"Connection error (127.0.0.1#5535): TCP connection failed while receiving payload length from upstream (Connection prematurely closed by remote server)"
I understand that this is detailed in this bug report, along with a possible fix via Unbound configuration, which I am going to try: TCP connection failed while receiving payload length from upstream
However, the upstream DNS server is Unbound listening on 127.0.0.1#55353. Note that the error message contains the wrong port number, with one digit dropped off the end. Pihole generally works so I don't think it's actually getting the port number wrong, I think it's just a problem with the error message.
Details about my system:
Pihole v6
Raspberry Pi 1 Model B
Raspbian Bookworm
Unbound on local port 55353
Nginx webserver running reverse proxy
Tricorder link: https://tricorder.pi-hole.net/oP5jWUjI/