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

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.

Certificate Chain Health Monitor

Chain Health Status