Dynamic DNS with Bind Stopped Working

In 2021 I set up a dynamic DNS server using the popular ISC bind DNS server and documented my configuration in a blog article [ 1 ] . Recently (around the second half of the year 2024) the DNS updates stopped working. In my configurations I was using the public key method for signing DNS updates also known as SIG(0). This was long supported in bind and is still documented to work – in the latest…