Certbot failed to authenticate some domains (authenticator: standalone)

My domain is: www.seekedgar.com

I ran this command: sudo certbot certonly --standalone -d www.seekedgar.com -d www.seekedgar.com

It produced this output:
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Requesting a certificate for www.seekedgar.com

Certbot failed to authenticate some domains (authenticator: standalone). The Certificate Authority reported these problems:
Domain: www.seekedgar.com
Type: connection
Detail: Fetching http://www.seekedgar.com/.well-known/acme-challenge/4aBloCW7ZzylqRF5kE93LyctNIDsv0lLffeTd_ME97Q: Connection refused

Hint: The Certificate Authority failed to download the challenge files from the temporary standalone webserver started by Certbot on port 80. Ensure that the listed domains point to this machine and that it can accept inbound connections from the internet.

Some challenges have failed.
Ask for help or search for solutions at https://community.letsencrypt.org. See the logfile /var/log/letsencrypt/letsencrypt.log or re-run Certbot with -v for more details.

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

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

The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot): certbot 1.21.0

Hi @MounicKumar, and welcome to the LE community forum :slight_smile:

HTTP can't reach the ACME client...
Is there a firewall that hasn't been opened?
Is there a NAT/port forwarding that hasn't been configured?


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