SSL Certificate Checker
Verify SSL/TLS certificates from multiple global locations. Check expiration, certificate chain, and security configuration.
About SSL Certificate Checker
Comprehensive SSL/TLS certificate analyzer that validates certificate chains, checks expiration dates, and verifies hostname matching from multiple global locations.
Key Features
Multi-region SSL validation
Certificate chain verification
Expiration monitoring
TLS version detection
Hostname validation
SSL certificates are the foundation of secure web communication, encrypting data between browsers and servers. Our multi-region SSL checker validates your certificate from 6+ global locations simultaneously, catching CDN edge misconfigurations and regional deployment issues that single-location tools miss.
Whether you're managing a simple website or complex multi-region infrastructure, our tool provides instant verification of certificate validity, expiration dates, TLS versions, and cipher strength. The health score gives you a quick assessment of your SSL configuration quality.
**Methodology:** TLS handshake from 6 probe regions capturing certificate chain, expiry, SANs, issuer, and protocol versions.
Common SSL Errors & How to Fix Them
Click to expand troubleshooting stepsBrowser shows "Your connection is not private" or NET::ERR_CERT_DATE_INVALID.
Renew your certificate immediately through your CA (Let's Encrypt, DigiCert, etc.). After renewal, deploy the new certificate to all servers and CDN edges. Clear CDN cache if using Cloudflare or similar.
Works in some browsers but fails in others. Mobile devices often affected first.
Include the intermediate certificate bundle when configuring SSL. Download the full chain from your CA and concatenate: your cert + intermediate(s). Test with openssl s_client -connect domain:443 -servername domain.
Certificate is valid but issued for a different domain. Shows NET::ERR_CERT_COMMON_NAME_INVALID.
Ensure your certificate includes all domains (www and non-www). Use a SAN certificate or wildcard (*.domain.com). Reissue if domains were missed during certificate request.
Modern browsers block TLS 1.0/1.1 connections. May work on old systems but fail on new ones.
Disable TLS 1.0 and 1.1 on your server. Enable TLS 1.2 and 1.3. For Apache: SSLProtocol -all +TLSv1.2 +TLSv1.3. For Nginx: ssl_protocols TLSv1.2 TLSv1.3;
SSL works from some locations but fails from others. Common with CDNs and multi-origin setups.
Check all CDN edge locations have the same certificate deployed. Verify origin server certificate matches CDN. Purge CDN cache after certificate updates. Check if geo-routing serves different origins.
Certificate not issued by a trusted CA. Browser shows ERR_CERT_AUTHORITY_INVALID.
Replace with a certificate from a trusted CA. Free options: Let's Encrypt (certbot), Cloudflare Origin CA. For internal services, add your CA to client trust stores or use a proper internal PKI.
Connection fails before exchanging any data. May be regional or affect specific clients.
Check server firewall allows port 443. Verify SNI is configured correctly for multiple domains. Ensure cipher suites match client capabilities. Check for IP blocking or rate limiting.
Connection works but uses outdated encryption (DES, RC4, export ciphers).
Configure strong cipher suites only. Recommended: ECDHE+AESGCM:ECDHE+CHACHA20. Disable CBC mode ciphers if possible. Use Mozilla SSL Configuration Generator for your server type.
Frequently Asked Questions
SSL certificate essentials explainedCDNs and load balancers often serve different SSL certificates at different edge locations. A certificate might be properly deployed in US data centers but expired or misconfigured in European nodes. Regional mismatches can also occur during certificate renewals if not all edges are updated simultaneously. Multi-region testing catches these inconsistencies before they affect users.
An intermediate certificate bridges the trust between your SSL certificate and the root CA (Certificate Authority) in browser trust stores. Without it, browsers can't verify your certificate's authenticity, causing "connection not private" errors. Some browsers cache intermediates, so the error may appear on some devices but not others. Always include your CA's intermediate certificate bundle.
Enter your domain above to see days until expiry. You can also check manually: click the padlock in your browser's address bar, view certificate details, and look for "Valid To" date. For command line: openssl s_client -connect domain.com:443 | openssl x509 -noout -dates. Set up monitoring alerts to notify you 30+ days before expiration.
Modern servers should support TLS 1.2 and TLS 1.3. TLS 1.3 is the latest standard with improved security and faster handshakes. TLS 1.0 and 1.1 are deprecated and blocked by major browsers since 2020. If our tool shows TLS 1.0/1.1, update your server configuration immediately to maintain security and browser compatibility.
CDNs typically terminate SSL at their edge and may use their own certificates (like Cloudflare's Universal SSL) or your uploaded certificate. If certificates don't match, check: 1) CDN SSL settings for custom certificate upload, 2) Origin pull settings if using Full (Strict) mode, 3) Whether CDN cache needs purging after certificate updates. Multi-region checks help identify edge-specific certificate issues.
Your server is sending only the end-entity (leaf) certificate without intermediate certificates. Browsers need the full chain to verify trust back to a root CA. Fix by concatenating your certificate with intermediate certificates in this order: your cert → intermediate(s) → (optional root). Most CAs provide a "full chain" or "bundle" file for this purpose.
Check immediately after any certificate changes or server updates. For ongoing monitoring, weekly checks catch issues before they affect users. Critical sites should use automated monitoring with alerts. Free Let's Encrypt certificates expire every 90 days, requiring more frequent attention than annual certificates from traditional CAs.
Our health score (0-100) weighs: certificate validity across all tested regions (60%), days until expiry (20% - higher scores for >60 days), TLS version (10% - TLS 1.3 scores highest), and cipher strength (10% - 256-bit encryption preferred). A score of 80+ indicates excellent certificate health. Below 50 requires immediate attention.
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