SSL Certificate Checks That Matter
Certificate checks are more than verifying a lock icon. Production validation should include hostname matching, expiry horizon, chain completeness, and protocol support. Missing intermediates or mismatched SAN entries can break clients even when browsers appear to work.
Track certificate expiry proactively with alert windows at 30, 14, and 7 days. Renewal failures often happen due to DNS changes, firewall rules, or ACME challenge path issues. Early warning removes release-day surprises.
TLS version and cipher support should align with modern security baselines while preserving compatibility for required client populations. Weak legacy protocol support can create compliance and risk issues, while over-aggressive hardening can break legitimate traffic.
Operationally, pair certificate checks with uptime probes and synthetic tests from multiple regions. Certificate problems are easiest to resolve when detected before users report outages.
Open related tool: SSL Certificate Checker
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