Web Reference: Aug 27, 2024 · 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. May 8, 2021 · As of August 2025, Let's encrypt uses a lot of Amazon EC2 servers. I found this after my server not renewing certificates, because my server blocks ALL Amazon EC2 connection. Best practice is renew certificate with iptables -F or put 'certbot renew' in /etc/rc.local before iptables loads. Sep 1, 2023 · Unfortunately, I've been having very severe problems getting new Let's Encrypt certificates for a good two months now. Sometimes it works, sometimes not. Sometimes only for the domain but not for the subdomain www. I have tried a lot. Firewall ports are open and not filtered.
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