unavailable via IPv6

I've tried to let the docker image nginxproxy/acme-companion and Gitea 1.17.1 automatically configure certificates for me. Both failed on a IPv6-only webserver since they could not reach In Gitea, I saw that the DNS lookup for the URL resulted in an IPv4 address. This makes me suspect that there is a problem in the DNS records of However, I have not been able to verify this via dig. What did work was using certbot manually. I suspect that certbot uses another endpoint.

My domain is:

The operating system my web server runs on is (include version):
Ubuntu 22.04

My hosting provider, if applicable, is:

I can login to a root shell on my machine (yes or no, or I don't know):

I'm using a control panel to manage my site (no, or provide the name and version of the control panel):

The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot):
Via nginxproxy/acme-companion and the built-in Gitea manager.

Looks good to me:

Perhaps check if your container can access any other IPv6 resources (or any external resources at all).


IPv6 does not work in Docker containers out of the box. Have you configured IPv6 for your containers and verified that it is working?


Thanks, Christopher and Max!


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