About

The Certificate Chain Health Check performs a comprehensive analysis of your SSL/TLS certificate chain to identify potential issues that could cause trust errors, connection failures, or degraded performance. It validates the complete chain from your leaf certificate through all intermediates to the trusted root, checking for expired certificates, incorrect ordering, missing intermediaries, and self-signed certificates in the path.

This tool goes beyond basic validation by analyzing key usage constraints, extended key usage compatibility, name constraints, and certificate policies that may affect trust. It also checks for cross-signed certificate compatibility issues and provides a health score indicating overall chain reliability. Use this tool regularly to proactively detect chain issues before they cause browser warnings or connection failures.

How to Use

1Enter the domain name you want to check (e.g., example.com)
2Optionally specify a custom port if your HTTPS service is not on the standard port 443
3Click "Check Health" to analyze the complete certificate chain
4Review the health report showing any issues found, their severity, and recommended fixes

Use Cases

•Proactive Monitoring: Run regular health checks on your certificates to detect chain issues before they cause browser warnings or service disruptions
•Post-Renewal Verification: Validate that newly renewed certificates have a correct chain after deployment to production servers
•Multi-Domain Auditing: Check chain health across all your domains to ensure consistent trust and prevent mixed-content or chain-related errors
•CDN Diagnostics: Identify when CDN providers serve incomplete or incorrectly configured certificate chains to end users
•Compliance Validation: Verify certificate chains meet organizational security standards and CA/Browser Forum Baseline Requirements

What The Health Check Covers

Four things about a deployment, each reported with a status so an unhealthy host is obvious without reading the details.

1Expiry, graded from critical to ok by days remaining. Expired is separated from expiring because one is an outage and the other is a scheduled task, and treating them identically is how one gets mistaken for the other.
2Protocol, checking the negotiated version against a floor of 1.2. Anything older is a warning regardless of what the configuration intends, because what is negotiable is what matters.
3Cipher and connection, with a missing cipher reported as a warning rather than passed over, and a failed connection reported as critical on its own rather than producing four zeroes.

A connection that fails produces a single connection finding, because nothing else was measured. Presenting zero scores for protocol, cipher and certificate when no connection existed would misrepresent an unreachable host as a scored one.

Tips & Best Practices

•Run health checks after every certificate renewal to catch chain issues immediately
•Monitor certificate chains for all domains in your infrastructure, not just the primary domain
•Pay special attention to intermediate certificate expiration dates — they expire independently of your leaf certificate
•If using a CDN, verify chain health from multiple geographic locations as CDNs may serve different chains

Technical Details

●Chain Validation: Verifies X.509 certificate chain from leaf to root using standard path validation algorithms

●Expiry Check: Validates all certificates in the chain are within their validity period

●Key Usage: Verifies keyUsage and extendedKeyUsage extensions are compatible with TLS server authentication

●Trust Store: Cross-references root certificates against Mozilla, Apple, Microsoft, and Google trust stores

Frequently Asked Questions

The health check detects expired certificates, incorrect chain ordering, missing intermediates, self-signed certificates in the chain, key usage violations, trust store mismatches, and potential compatibility issues with older clients. Each issue is categorized by severity (critical, warning, info) to help prioritize fixes.

We recommend checking chain health after every certificate renewal, after any infrastructure changes (CDN updates, server migrations, load balancer configuration), and at least monthly as part of routine security monitoring. Automated checks via the API can be integrated into your monitoring pipeline.

The report provides specific remediation steps for each issue found. Common fixes include downloading the correct intermediate certificate from your CA, reordering certificates in your server configuration, or contacting your CDN provider to update their certificate chain. For critical issues, renew your certificate with the correct chain immediately.

Different scope. The chain checker examines certificate composition — whether the chain is complete, correctly ordered and anchored to a trusted root. This page is a quick health summary covering expiry, protocol version and cipher. Use this for a fast yes-or-no across many hosts, and the chain pages when the composition itself is the question.

Because it is the only finding here that will resolve itself into an outage whether or not anyone acts. A protocol or cipher finding affects only the clients that negotiate the weak option; an expired certificate breaks every visitor and every automated client at once. Grading it separately makes the difference between a scheduled task and an incident visible at a glance.

Either no cipher information was returned, or the negotiated cipher is one worth reviewing. The page reports the suite it saw so you can judge which case applies. On a modern deployment the suite is normally an AEAD one and there is nothing to do; the finding becomes actionable when static RSA or a CBC suite appears.

Yes, and the per-check structure is what makes it useful in bulk. A sweep across an estate shows which hosts are close to expiry and which are on old protocols, which are the two things that need attention before anything else. Run it on a schedule and alert on the critical statuses rather than reading the reports — automation that fails silently is worse than none.

Start with reachability rather than configuration, since nothing was measured. Confirm the hostname resolves and the port is open, then use the negotiation debugger to find which stage failed. Once a connection completes, the other checks become meaningful — until then, any configuration conclusion would be a guess.

Certificate Chain Health Monitor

Chain Health Status