Cannot create a Let's Encrypt certificate even if the domain is accessible from internet

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My domain is:

I ran this command:
sudo certbot --nginx -d

It produced this output:
Certbot failed to authenticate some domains (authenticator: nginx). The Certificate Authority reported these problems:
Type: dns
Detail: DNS problem: query timed out looking up A for

My web server is (include version):
nginx 1.18.0

The operating system my web server runs on is (include version):
Ubuntu 20.04 LTS

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):
I'm using SSH.

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

If I execute this command on my PC (not on my server, which is in a remote server farm):
I get the HTML code of my page.
If I use
I receive the correct DNS A record.

Thank you for help!

Hi @altthomas welcome to the LE community forum :slight_smile:

There is a huge DNS problem with your domain.
The "two" authoritative DNS servers resolve to only one IP.

And that one IP is mostly unresponsive.

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Thank you so much.
I solved the problem changing the authorative DNS servers and retrying.

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