Certbot Renewal Failed
Let's Encrypt could not reach the HTTP-01 challenge on port 80, or the DNS for the name no longer points at this server. Check the site below to confirm what is wrong.
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SSL Certificate Checker
The error, and the fix
Error CodesChallenge failed · Timeout during connect
Usual CauseLet's Encrypt could not reach the HTTP-01 challenge on port 80, or the DNS for the name no longer points at this server
Check From a Terminalopenssl s_client -connect example.com:443 -servername example.com
Let's Encrypt could not reach the HTTP-01 challenge on port 80, or the DNS for the name no longer points at this server.
How to fix it: Keep port 80 open, check the A/AAAA records point here (including IPv6), and run certbot renew --dry-run to test.
Questions
What does "certbot renewal failed" mean?
Let's Encrypt could not reach the HTTP-01 challenge on port 80, or the DNS for the name no longer points at this server.
How do I fix it?
Keep port 80 open, check the A/AAAA records point here (including IPv6), and run certbot renew --dry-run to test.
Is it safe to click through the warning?
Not on a site where you enter passwords or payment details: the connection may not be private. Fix the certificate instead.
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