Error:-
ubuntu@thirumal:~$ sudo certbot renew --dry-run
Saving debug log to /var/log/letsencrypt/letsencrypt.log
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Processing /etc/letsencrypt/renewal/www.thirumal.com.conf
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Account registered.
Simulating renewal of an existing certificate for www.thirumal.com
Certbot failed to authenticate some domains (authenticator: nginx). The Certificate Authority reported these problems:
Domain: www.thirumal.com
Type: connection
Detail: 18.60.72.242: Fetching http://www.thirumal.com/.well-known/acme-challenge/5X3aRcZZoJOOChjfToF4ovnPKmwvnOS2eD7JxhHgFXM: Timeout during connect (likely firewall problem)
Hint: The Certificate Authority failed to verify the temporary nginx configuration changes made by Certbot. Ensure the listed domains point to this nginx server and that it is accessible from the internet.
Failed to renew certificate www.thirumal.com with error: Some challenges have failed.
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All simulated renewals failed. The following certificates could not be renewed:
/etc/letsencrypt/live/www.thirumal.com/fullchain.pem (failure)
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1 renew failure(s), 0 parse failure(s)
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.
Possible Solution:
Enable PORT 80, make it available for internet access, 443 itself is not enough.