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

Help
1

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)

2

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.

3

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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