Was setting up a new Debian Bookworm system in my home environment. So far I was not using certificates at home, and wanted to change this along the way, using Let's Encrypt. Since the IP-addresses here are RFC1918, I can't use the http01 challenge, and have to resort to dns01 challenges. On Debian Bookworm, using certbot, this fails reproducible.
Posted by ads' corner on Monday, June 9, 2025