Trouble with Certbot Authentication for gomaa.uk: Firewall or Connectivity Issues

My domain is:
gomaa.uk

I ran this command:
sudo certbot certonly --standalone -d gomaa.uk -d www.gomaa.uk -d mail.gomaa.uk

It produced this output:

Certbot failed to authenticate some domains (authenticator: standalone). The Certificate Authority reported these problems:
Domain: gomaa.uk
Type: connection
Detail: 167.86.73.80: Fetching http://gomaa.uk/.well-known/acme-challenge/ffMGV7wO5WKl7i9HHHlPGhih0N4tS6_26_I745mGecs: Timeout during connect (likely firewall problem)

Domain: mail.gomaa.uk
Type: connection
Detail: 167.86.73.80: Fetching http://mail.gomaa.uk/.well-known/acme-challenge/owTI1u9H7pMB69Vx5yfn0Ew2Y_j7eLpBu20-OU6a23I: Timeout during connect (likely firewall problem)

Domain: www.gomaa.uk
Type: connection
Detail: 167.86.73.80: Fetching http://www.gomaa.uk/.well-known/acme-challenge/gsfwN8Fpq9fVYUR2qLHFO8uDi6TT-_LjGBCnGNa-nhU: Timeout during connect (likely firewall problem)

My web server is (include version):
N/A (I am using Certbot with the standalone authenticator, which doesn't require a web server like Apache or Nginx).

The operating system my web server runs on is (include version):
CentOS 8, Linux kernel 4.18.0-553.el8_10.x86_64

My hosting provider, if applicable, is:
(Include the name of your hosting provider, if known)

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):
(Provide the output of certbot --version, e.g., certbot 2.9.0)

Weird, I'm seeing a webserver responding claiming to be Apache on your hostname.

If I can connect, but Let's Encrypt cannot, most likely some kind of geoblocking is in place.

That can be difficult to debug, especially for Let's Encrypt community volunteers as the Certbot spun up temporary webserver is only up while validation is happening. :frowning:

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