#certbot

"Certificate has expired": check the dates, renew it, and find out why it didn't renew

Fix "certificate has expired" and NET::ERR_CERT_DATE_INVALID: check the dates with openssl, renew with Certbot, reload the server, and fix why renewal or clock failed.

Beginner · 4 min read

failed to authenticate some domains

Security

Certbot "failed to authenticate some domains": read the Type, then fix DNS, port 80 or the path

Fix Certbot "failed to authenticate some domains": read the error type, then fix DNS records, an IPv6 AAAA record, a closed port 80, the webroot, Cloudflare and CAA.

Intermediate · 5 min read