The SSL Expiry Time Bomb
An expired SSL certificate is one of the most preventable—and embarrassing—outages a SaaS company can experience. Modern browsers block access entirely with scary warning pages. Your users can't reach you, and your brand takes a hit.
Why Auto-Renewal Isn't Enough
Let's Encrypt and cloud providers offer auto-renewal, but it fails more often than you'd think.
DNS Validation Failures
If your DNS provider has an API outage during renewal, the ACME challenge fails. The cert expires, and you don't know until users complain.
Permission Changes
An IAM policy change, API key rotation, or provider configuration update can silently break your auto-renewal. You won't know until 60–90 days later.
Wildcard Certificate Gaps
Auto-renewal for wildcard certs often requires different validation than single-domain certs. A new subdomain might not be covered by your wildcard.
Monitoring a Commercial SaaS?
FourSight includes 25 commercial-safe monitors with multi-region validation.
Start Monitoring FreeSetting Up SSL Monitoring
FourSight's SSL monitoring checks your certificate expiry date, chain validity, and configuration daily. You'll get alerts 30, 14, and 7 days before expiry—plenty of time to fix any auto-renewal issues.
Certificate Chain Validation
An incomplete certificate chain causes failures on some clients but not others. Mobile browsers are especially strict about chain completeness. FourSight validates the entire chain, not just the leaf certificate.
SSL Configuration Best Practices
Beyond expiry, monitor your SSL configuration for security issues: weak cipher suites, outdated TLS versions, and missing HSTS headers. These don't cause outages, but they create security vulnerabilities and can affect your SEO ranking.