How to monitor SSL certificate expiration
Expired certificates cause outages, browser warnings, and lost trust. Here is how to monitor SSL certificate expiration reliably — without building a homegrown cron job.
Track the live certificate served on port 443, not just what was issued. A renewed cert that was never deployed still breaks production.
Watch Certificate Transparency logs so you are alerted the moment a new certificate is issued for your domain.
Alert on staged thresholds — 30, 14, 7 and 1 days before expiry — across email, Slack and webhooks, so the right person is paged in time.
Automate the whole loop. CertFleet probes the real TLS certificate, cross-references CT logs, and notifies you before anything expires.
CertFleet probes the live certificate, watches Certificate Transparency, and alerts you 30/14/7/1 days before expiry. Free for 5 certificates, no card.