TLS & certificates
Certificate within its validity period
Certificate validity and trust, key strength and protocol versions.
Why it matters
Browsers show a full-page security error instead of the site. Most visitors leave, and APIs and payment integrations stop working.
How to fix it
Quick fix · under 1 hour- Renew the certificate now.
- Automate renewal so it cannot lapse again.
- Add expiry monitoring as a second safety net.
certbot
sudo certbot renew sudo systemctl reload nginx
Test this now, free: SSL certificate checker - no sign-up.
How we test it
The check runs from the public internet as part of every scan, read-only and without touching your data. If it fails, your report shows the evidence that proves it - the record, header, file or banner we observed - together with the fix above, tailored to the issue we found.
Does your domain pass this check?
Run all 97 checks in about a minute. Your first scan is free, with the complete fix for your most urgent finding.
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