Can't get certificate for Subdomain

I have the following problem. I need a Let's Encrypt certificate for the following subdomain "intranet.gms-ammerbuch.de" The domain is registered with our provider as a DNS entry and points to our fixed IP 87.191.196.122.
Nextcloud is to be set up for our school under this subdomain. Nextcloud runs on UCS Server (Ubuntu?) and uses a Let's Encrypt plugin. Unfortunately, the initialization script always breaks off with an error when setting up Nextcloud. How can I register the subdomain with Nextcloud?
My domain is: gms-entringen.de
Subdomain: intranet.gms-entringen.de

The domain gms-entringen.de is not registered at all. Anyone could register it right now.

Also, please don't remove questions from the questionnaire.

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Sorry, I didn't know that. As I am completely new to Let's Encrypt, what can I do. Thanks very much

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Two things:

  1. explicitely tell us which hostname you're actually trying to get a certificate for, as your first post mentions two domains: one existing and one non-existing. Which is confusing.
  2. answer the rest of the questionnaire to the best of your knowledge. This includes the exact error you're getting from Nextcloud. Merely mentioning "there was an error" does not help at all, as crystal balls are a thing of fiction, not reality. Where it says "command" you can also read "I did the following to attempt to get a certificate" (e.g., which buttons did you push or something similar).

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):

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

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Sorry, I made a mistake. The domain is gms-ammerbuch.de and the Subdomain intranet.gms-ammerbuch.de

The hostname is intranet.gms-ammerbuch.de

I ran this command:

It produced this output:

My web server is (include version): apache (version?)

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

My hosting provider, if applicable, is: belwue.de

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):

image001.jpg

Thanks for completing the form but that's not much info for us to work with.

I cannot connect to your domain using HTTP. One of the methods for getting a cert from Let's Encrypt requires LE to connect to your domain using HTTP. This is likely the method NextCloud is using so you should fix your connection problems. A test site like Let's Debug is helpful to test changes.

A Nextcloud forum would be better if you need help configuring that.

https://letsdebug.net

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