DNS server failure after latest update

Expected Behaviour:

The DNS server working after latest upgrade.

  • Raspbian 13
  • Raspberry Pi

Actual Behaviour:

The DNS server in the GUI says it has failed in red letters, and indeed it does not work.

Debug Token:

https://tricorder.pi-hole.net/gqLMqoVo/

Pi-hole should use port 53, but this port is already in use:

2026-05-13 18:51:42.625 MDT [2688M] CRIT: Error in dnsmasq configuration: failed to create listening socket for port 53: Address in use