404 Not found on SSL certificate renew with certbot from letsencrypt

I spend a lot of time figuring out why I kept getting a ‘404 Not Found’ when I wanted to renew my SSL Certificate with certbot.

Long story short: invalid ipv6 DNS Mapping.

I got it working by removing the ipv6 DNS entry. I’ll be fixing it in a proper way when there is more time available.

But there were other gotcha’s as well:

• basic auth on the directory
• iptables blocking certain traffic

 

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