name: ssl-certificate-checker description: Check SSL/TLS certificate details including expiration date, issuer, validity, cipher suites, and security warnings for any domain. Use when verifying HTTPS security, monitoring certificate expiry, or troubleshooting SSL issues.

SSL Certificate Checker

Analyze SSL/TLS certificates for any domain to verify security configuration and monitor expiration.

When to Use

• Checking SSL certificate expiration dates
• Verifying certificate chain and issuer
• Troubleshooting HTTPS connection issues
• Auditing website security configuration
• Monitoring certificates before renewal

When NOT to Use

• Penetration testing (this is read-only)
• Internal network certificates (use dedicated tools)
• Certificate installation (this only checks, doesn't install)

Examples

Basic Certificate Check

# Check certificate for a domain
openssl s_client -connect example.com:443 -servername example.com </dev/null 2>/dev/null | openssl x509 -noout -dates -subject -issuer

# Get detailed certificate information
echo | openssl s_client -connect example.com:443 -servername example.com 2>/dev/null | openssl x509 -noout -text