SSL certificate expiry monitoring
Quick answer
StillOnline SSL checks probe HTTPS certificates for expiry date and alert you before visitors see browser warnings. SSL monitoring is available on all plans (including Free) and counts toward your URL/check limit per project—same quota as HTTP checks. Default warning threshold: 14 days before expiry (sslAlertDays).
Benefits
- Avoid surprise outages — renew Let’s Encrypt or commercial certs on time.
- Same alert paths — SSL failures use owner alerts (email, Telegram, Slack).
- No extra product — bundled with uptime monitoring.
- Issuer and days left — visible in check results.
- Works with status pages — SSL component can show degraded state.
How it works
- Add an SSL check (or HTTPS URL check with SSL validation) to a project.
- StillOnline reads the certificate chain from the public endpoint.
- If expiry is within your alert window, you get owner alerts.
- Expired or invalid certs mark the check down and can open incidents.
- Renew at your registrar or ACME client, then wait for the next probe.
Plan availability
| Plan | SSL checks | Quota |
|---|---|---|
| Free | Yes | 1 check / project (shared with HTTP) |
| Pro | Yes | Up to 10 checks / project |
| Ultimate | Yes | Up to 25 checks / project |
FAQ
Does SSL monitoring cost extra?
No separate SKU. It uses your check quota on the current plan.
Can I monitor non-HTTPS URLs for SSL?
SSL checks require HTTPS endpoints with valid TLS handshakes.
What happens when the cert expires?
The check goes down, owner alerts fire, and your status page can show an incident.
Is custom alert lead time configurable?
Projects use a default 14-day alert window in product settings. Adjust per check where the UI exposes sslAlertDays.