# Ssl Certificate Checker

> 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.

- Skill: `dvcrn/ssl-certificate-checker` (Agent Skill)
- Install (CLI): `npx skillmds@latest add dvcrn/ssl-certificate-checker`
- Raw SKILL.md: https://api.skillmd.com/api/skills/dvcrn/ssl-certificate-checker/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Security
- Author: dvcrn (https://skillmd.com/u/dvcrn)
- Updated: 2026-09-08
- Page: https://skillmd.com/skills/dvcrn/ssl-certificate-checker

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# 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

```bash
# 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