SSL Certificate Monitoring
An expired SSL certificate silently breaks your site for every visitor. DownWarning watches your certificates and alerts you weeks before expiration — giving you plenty of time to renew without any service disruption.
Signature Tracking
We store your certificate fingerprint and detect when it changes unexpectedly — catching misconfigurations or unauthorized re-issuance.
Expiry Countdown
See exactly how many days remain on every certificate in your dashboard. Visual indicators turn from green to amber to red as the deadline approaches.
Advance Alerts
Receive notifications via Slack, Telegram, Email, or Webhooks well in advance — so renewals are routine, not emergencies.
Why SSL monitoring matters
Modern browsers block access to sites with expired certificates, instantly cutting off your traffic. Search engines also penalize HTTPS errors in their rankings. A single missed renewal can cascade into lost revenue, damaged SEO, and eroded customer trust.
DownWarning makes SSL renewals predictable. All plans include SSL monitoring at no extra cost.
Renewals fail more often than people expect: a script stops running, a wildcard cert gets forgotten, or a new subdomain never gets added to the renewal job. Monitoring the certificate itself, independent of whatever automation is supposed to renew it, catches the failure before a browser warning does it for you. This matters most for teams running their own renewal automation with tools like Let's Encrypt or an internal certificate authority, where a single silent failure can go unnoticed for months.
SSL monitoring pairs naturally with the rest of your uptime checks: the same dashboard that tells you a service is reachable also tells you whether the certificate securing it is about to become a problem. Teams running dozens of domains and subdomains use it to replace a spreadsheet of manually tracked expiration dates with a single view that alerts on its own, weeks before anyone would have noticed the countdown by hand.
SSL Monitoring FAQ
How far in advance will I be alerted before a certificate expires?
Alerts fire well before the expiration date, giving your team time to renew and redeploy without any pressure. You can see the exact countdown for every certificate at any time on your dashboard.
Does DownWarning monitor certificates on internal or private domains?
Yes. Combine SSL monitoring with a local agent to check certificates on internal services and private domains that aren't reachable from the public internet.
What happens if a certificate's fingerprint changes unexpectedly?
DownWarning flags it immediately. An unexpected signature change usually means a misconfigured renewal, a manual re-issuance nobody documented, or in rare cases something worth investigating from a security standpoint.
Do I need to add anything to my server to enable SSL monitoring?
No. SSL monitoring works the same way an HTTP check does — DownWarning connects to your domain, reads the certificate presented during the TLS handshake, and tracks it from there. No agent or server-side change is required for public-facing domains. It's on by default for every HTTPS monitor you create.