How to monitor SSL certificate expiry
An expired SSL certificate throws a full-page browser warning that scares away every visitor — and it always seems to happen on a weekend. SSL monitoring checks each site's certificate on a schedule and warns you days before it lapses, so a renewal is a calendar task instead of an emergency.
What SSL monitoring actually checks
A monitor connects to the site over TLS, reads the certificate, and inspects three things: is it currently valid, is the chain trusted by a real certificate authority, and how many days until it expires. Good monitoring flags 'not yet trusted' and self-signed certificates too, because those break browsers just like an expired one.
When to get alerted
Alert at 30 days (plan the renewal), again at 14 days (act now), and immediately if the certificate is already expired or untrusted. Auto-renewal via Let's Encrypt fails more often than people think — a cron job dies, a DNS record changes — so monitoring is the safety net even when renewal is automated.
Watching many sites at once
For freelancers and agencies watching many client sites, checking certificates by hand across dozens of client domains does not scale. A dashboard that lists every site with its days-to-expiry, and emails you before anything lapses, turns a recurring risk into a non-event you can even report on to clients.
Frequently asked questions
How early should I renew an SSL certificate?
Renew at least two weeks before expiry. It leaves room for DNS propagation and validation to complete without any gap in coverage.
Does auto-renewal make monitoring unnecessary?
No. Auto-renewal scripts fail silently more often than expected. Monitoring confirms the new certificate is actually live and trusted.
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