SSL Certificate Checker

Check your SSL certificate at least monthly, especially 30 days before expiration. Set up automated monitoring with tools like AtomPing to receive alerts before certificates expire. Most modern certificates from Let's Encrypt expire every 90 days, so regular checks are essential.

Expired SSL certificates cause browsers to display security warnings, blocking most visitors from accessing your site. Search engines may penalize your site, and users will lose trust in your brand. Set up automatic renewal or monitoring to prevent expiration.

HTTP (Hypertext Transfer Protocol) transmits data in plain text, which can be intercepted. HTTPS (HTTP Secure) uses SSL/TLS encryption to protect data in transit. Modern browsers mark HTTP sites as 'Not Secure' and may block certain features. HTTPS is now the web standard.

Yes! SSL certificates are essential for all websites. Even if you don't handle payments, SSL protects login credentials, form submissions, and user privacy. Google uses HTTPS as a ranking signal, and browsers warn users about HTTP sites. Free certificates are available from Let's Encrypt.

A wildcard certificate secures a domain and all its subdomains using a single certificate. For example, *.example.com covers www.example.com, blog.example.com, shop.example.com, etc. This simplifies certificate management when you have multiple subdomains.

HTTP Strict Transport Security (HSTS) is a security policy that forces browsers to only connect via HTTPS, even if users type 'http://' or click an HTTP link. This prevents downgrade attacks and cookie hijacking. Enable HSTS with a long max-age value for enhanced security.

Domain mismatch errors occur when the certificate's Common Name (CN) or Subject Alternative Names (SANs) don't include your domain. Obtain a new certificate that includes your exact domain. For multiple domains, use a multi-domain (SAN) certificate or wildcard certificate.

Self-signed certificates are not signed by a trusted Certificate Authority (CA), so browsers display warnings. They're useful for testing and internal systems but should never be used on public websites. Use free certificates from Let's Encrypt or commercial CAs for production sites.

The certificate chain shows the path of trust from your server certificate through intermediate CAs to a root CA. Browsers verify this chain to trust your certificate. An incomplete chain causes errors. Always install the full chain provided by your CA, including intermediate certificates.

Use Let's Encrypt with Certbot for fully automated renewal every 60 days. Most hosting providers offer automatic SSL management. For manual certificates, set up monitoring tools like AtomPing to alert you 30 days before expiration. Store renewal dates in your calendar or ticketing system.