Error: Could not issue a Let's Encrypt SSL/TLS certificate for ns1.allgrass.es. Authorization for the domain failed.

Invalid response from https://acme-v01.api.letsencrypt.org/acme/authz/VMQp2Wufkc-WddiA7ZQie7cMxTKly9rG-pD2yd3el20.
Details:
Type: urn:acme:error:connection
Status: 400
Detail: Fetching http://ns1.allgrass.es/.well-known/acme-challenge/7rvqHeXGOWqCwiOGdV6Kw1blKrwndUMetHzHoBP5-3M: Connection refused

Hi @ReiRodR,

Could you please fill out this form?

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. https://crt.sh/?q=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:

I ran this command:

It produced this output:

My web server is (include version):

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

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):

My domain is: allgrass.es / ns1.allgrass.es

I ran this command: something with varnish and/or http/2

It produced this output:

My web server is (include version): apache2.4
The operating system my web server runs on is (include version): ubuntu 16.04.3

My hosting provider, if applicable, is:

I can login to a root shell on my machine (yes or no, or I don’t know): ssh? then yes…

I’m using a control panel to manage my site (no, or provide the name and version of the control panel): plesk 17.5.3

Sorry, I don’t understand this yet. What steps did you take to try to obtain the certificate, using what kind of software or interface? What software produced the “Invalid response” message, and was there other output in addition to what you pasted in your first post?

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