Yesterday I updated my Raspberry Pi to version 11 (Bullseye). The main usage for my Raspberry Pi is Pi-hole; a network-wide ad-blocker.
But that stopped working and could not be started because of the following error; "FTL failed to start due to failed to create listening socket for port 53: Address already in use".
With the command
sudo netstat -nltup | grep 'Proto\|:53 \|:67 \|:80 \|:471'
I figured out that a system component of Raspberry OS version 11 was bind to port 11; connmand.
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