SSL Checker (SSL: Secure Sockets Layer)
Verify SSL/TLS certificate validity, issuer details, and expiry. Use this before production launches, domain migrations, and compliance audits to avoid unexpected certificate outages.
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Why SSL/TLS checks matter
Certificate outages can break login, checkout, API trust, and SEO trust signals. Expired or misconfigured certificates produce browser warnings and can immediately reduce user confidence and conversion.
Short forms and full names
- SSL: Secure Sockets Layer (legacy term)
- TLS: Transport Layer Security (modern standard)
- CA: Certificate Authority
- SAN: Subject Alternative Name
- CSR: Certificate Signing Request
Useful methods for production teams
- Monitor certificate expiry weekly for all public domains.
- Keep renewal automation and fallback manual process documented.
- Validate SAN coverage when adding subdomains.
- After renewals, verify live chain and issuer as expected.
- Use alerting before expiry threshold (e.g., 30/14/7 days).
Tips and tricks
- Check both apex and www hostnames; certificates can differ.
- After CDN/proxy changes, re-check certificate issuer and validity.
- Use this with uptime monitoring for end-to-end reliability.
- Document certificate owners and renewal responsibility internally.
FAQ
Is SSL same as TLS? TLS replaced SSL, but SSL is still widely used as shorthand.
What is a good warning threshold? Many teams alert at 30 days, then 14 and 7 days.
Can this check private/internal certs? This endpoint checks public TLS handshake over port 443.