Unauthorized: it was working fine before but now it's not

[boang311]

Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. crt.sh | example.com), so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.

My domain is: depedcebucity.com

I ran this command: sudo certbot --apache

It produced this output:

• The following errors were reported by the server:

  Domain: depedcebucity.com
  Type: unauthorized
  Detail: 2607:f1c0:86e:6e00::7b:7d0c: Invalid response from
  http://depedcebucity.com/.well-known/acme-challenge/DX9DjyssTJf8IePTh2gTjr9eILDhAWaAeDWQAVXuVto:
  404

  To fix these errors, please make sure that your domain name was
  entered correctly and the DNS A/AAAA record(s) for that domain
  contain(s) the right IP address.

My web server is (include version): Apache2

The operating system my web server runs on is (include version): Ubuntu 18.04 bionic

My hosting provider, if applicable, is: localhost

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

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

The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot): certbot 0.31.0

[MikeMcQ]

You have an AAAA record in your DNS for IPv6 that points to the wrong server. You should correct that address to point to your server. Remove that record if you do not support IPv6.

See the IPv6 response is from an nginx server not Apache2

Test result for depedcebucity.com: Warning

@boang311

certbot 0.31.0

Also that is a very old version which you should upgrade to the snap version if possible. It isn't causing this problem but it is quite old and missing numerous features compared to the modern version

Certbot

[boang311]

Thank you, everyone, for dedicating your time to finding a solution for this matter. I have already reached out to the responsible party, and I anticipate that the problem will be resolved as soon as possible