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SSL Certificate Checker

Check your SSL certificate status, expiration date, and security details.

Understanding SSL Certificates

What is SSL/TLS?

SSL (Secure Sockets Layer) and its modern successor TLS (Transport Layer Security) are cryptographic protocols that provide communications security over a computer network. They ensure that all data passed between the web server and browser remains private.

Certificate Types

  • Domain Validation (DV)
  • Organization Validation (OV)
  • Extended Validation (EV)
  • Wildcard Certificates
  • Multi-Domain (SAN) Certificates

Security Indicators

  • Padlock icon in browser
  • HTTPS in URL
  • Valid certificate dates
  • Trusted certificate authority
  • Proper domain matching

Common SSL Issues and Solutions

Certificate Errors

  • Expired Certificate: Renew before expiration date
  • Name Mismatch: Ensure certificate matches domain
  • Untrusted Issuer: Use recognized Certificate Authority
  • Incomplete Chain: Install intermediate certificates

Best Practices

  • Regular Monitoring: Check certificate status frequently
  • Automation: Use auto-renewal when possible
  • Documentation: Keep records of all certificates
  • Security: Use modern TLS versions (1.2+)

Frequently Asked Questions

How often should I check my SSL certificate?

It's recommended to check your SSL certificate at least monthly, with automated monitoring being the best practice. Critical systems should be monitored daily.

What happens if my SSL certificate expires?

An expired SSL certificate will trigger browser warnings, potentially blocking access to your website and damaging user trust. It can also affect SEO rankings and e-commerce capabilities.

How do I renew my SSL certificate?

Certificate renewal typically involves generating a new CSR, submitting it to your CA, and installing the new certificate. Many providers offer automatic renewal services.

What is Certificate Transparency?

Certificate Transparency is a system for logging and monitoring SSL certificates. It helps detect mistakenly or maliciously issued certificates and improves overall SSL security.

Technical Specifications

Protocol VersionsTLS 1.2, TLS 1.3 (Recommended)
Key TypesRSA, ECDSA
Common Key Sizes2048-bit RSA, 256-bit ECDSA
Hash FunctionsSHA-256, SHA-384

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