Q: I use automatic certificate renewal, so I don't need SSL monitoring, correct?

Q: I use automatic certificate renewal, so I don't need SSL monitoring, correct?

A: I wish, but no, and this assumption causes real outages. Auto-renewal (Let's Encrypt, ACME clients) fails silently more often than people expect: a cron job stops running, a port 80 validation gets firewalled, a DNS challenge breaks, or the renewed cert never reloads into the web server.

The myth is that automation removes the need to verify. Automation removes the manual work, not the responsibility to confirm it worked.

Recommendation: keep an independent external check that reads the live certificate's actual expiry from outside your network, separate from the renewal system. If renewal silently dies, this is the only thing that catches it before users do.

Follow-up: also assert the served cert matches the domain, wrong cert errors look like expiry to users.

Got a question? Drop it in the comments.