Upgrade from Raspbian to Bullseye and DNS won't start

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1

The issue I am facing:
I recently did a distro update from Buster to Bullseye. After the distro update finished Pi-hole is semi working. For some reason the DNS service won't start back up.
Debug report from the (Pi-hole debug log file)

Details about my system:
I'm currently using a Pi4. It is setup to have Pi-hole, Unbound and, NTP services working on it.

What I have changed since installing Pi-hole:
I did a distro update from Buster to Bullseye following the ([Tom's Hardware guide] (How To Upgrade Raspberry Pi OS to Bullseye from Buster | Tom's Hardware)). Due to update of Raspbian to Bullseye I did change the security mirror to deb http://security.debian.org/debian-security/ bullseye-security main contrib non-free

I have rebooted the machine many times and tried the following commands to no avail.
pihole -up (did update Web-interface version)
pihole status (did identify that DNS Service not running)
pihole restartdns (says restarted but, running status right after shows DNS not started)

I have also tried reinstalling pi-hole but, that did not get the DNS service working.

2

Not recommended by Raspbian or Debian.

You have connmand running on port 53, which prevents FTL from binding to that port.

[✗] udp:127.0.0.1:53 is in use by connmand (https://docs.pi-hole.net/main/prerequisites/#ports)
3

I’m not familiar with connman. Is that part of the po-hole install process? I don’t recall ever installing that service. Trying to figure out which install put it there? Is that a normal install for Bullseye?

4

No. It was probably installed when you upgraded the OS.

This service is using port 53 and you need to disabled it.
Pi-hole (more precisely pihole-FTL) needs port 53 to work.

6

Disable the connman DNS proxy/stub bit so it wont conflict with the pihole-FTL daemon over port 53:

7

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