Assessment failed: Unable to connect to the server

My domain is:
https://old2.alpha-tel.ru/

I ran this command:
sudo certbot --nginx

It produced this output:
Connection attempt failed

My web server is (include version):
nginx/1.14.0 (Ubuntu)

The operating system my web server runs on is (include version):
Ubuntu 18.04.2 LTS

My hosting provider, if applicable, is:
We have own hosting

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

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 PPA

Hi @instinct_boy

checking your domain there is a timeout - https://check-your-website.server-daten.de/?q=old2.alpha-tel.ru

Domainname Http-Status redirect Sec. G
http://old2.alpha-tel.ru/ 193.222.191.17 301 https://old2.alpha-tel.ru/ Html is minified: 107,78 % 0.203 A
https://old2.alpha-tel.ru/ 193.222.191.17 -14 10.030 T
Timeout - The operation has timed out

Looks like a firewall or something else.

Works https internal?

curl https://old2.alpha-tel.ru/

from that server.

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