Capability
SSL expiry monitoring: how an uncaught cert costs you every visitor for a week.
A certificate that quietly failed to renew costs the day it breaks: every visitor sees the red warning bar, every form submit goes unencrypted, every paid checkout abandons. SSL expiry monitoring is the daily probe that catches the failure to renew weeks before the browser does.
- Daily probe of the cert path on every watched URL.
- Email cadence at 90, 30, 7, and 1 day before expiry. Four chances to renew.
- Names the URL, the CA in the chain, and the exact expiry date in every alert.
- Catches the silent Let’s Encrypt auto-renew failure that the host thinks succeeded.
- No agent on your server. The probe is what a browser would do.
How it works
Setup, in three beats.
Step 01
Add the URL behind each certificate you care about
Paste https://example.com (the URL a visitor types, not the cert file path). SiteGuardian opens the TLS connection the same way a browser does, reads the certificate, and notes the expiry date and the issuing CA. The next probe starts the same minute.
Step 02
Let the daily cadence surface the renewal that quietly failed
Most hosts report a successful auto-renew for a Let’s Encrypt cert, then the renew path actually fails because the DNS-01 challenge no longer matches. SiteGuardian’s cert probe catches the day the expiry date stops moving forward on the renewal. One email per missed renewal.
Step 03
Renew or migrate before the browser warning harms the week
A certificate that expires publicly costs the whole week: visitors bounce at the warning bar, paid checkout abandons because Trust标志 is gone, search engines quietly demote the URL. SSL monitoring is the leading signal, not a substitute for the renewal itself.
What the alert actually says
One email. One URL. One timestamp.
Your certificate for https://example.com expires on 2026-09-14. Today is 2026-06-16. The cert has not renewed since 2026-06-14. Renew now or risk the browser warning page that costs a week of visits.Frequently asked
The ssl expiry monitoring questions, answered flat.
Frequently asked
Related reading
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Starter is $19 a month — one site, ten URLs, every-five-minute checks. Pro is $39 a month — three sites, fifty URLs, every-minute checks. Lifetime is $299 paid once and stays yours with every future update included.
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