SSL Certificate Expiry Checker

Check when your SSL certificate expires. Monitor expiration dates from multiple global locations.

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

Also Available via API & MCP Server

Automate ssl certificate checker checks in your CI/CD pipelines or run them directly from your AI coding agent.

REST API

Single endpoint, JSON response. Integrate into any language or platform.

cURL

curl -X POST https://probeops.com/api/v1/run \
  -H "X-API-Key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"tool": "ssl_check", "target": "example.com"}'

Learn more about the API

MCP Server

Works with Claude Code, Cursor, Windsurf, and any MCP-compatible IDE.

Claude Code

> Check the ssl certificate checker for example.com

Claude uses the probeops_ssl_check tool to run
the check from 6 global regions and returns
structured results.

Learn more about the MCP Server

Certificate expiration is the leading cause of preventable SSL outages. When a certificate expires, browsers immediately block access with scary security warnings, damaging user trust and SEO rankings. Our expiry checker monitors your certificate's remaining validity from multiple global locations.

Set up proactive monitoring to receive alerts 30, 14, and 7 days before expiration. Free Let's Encrypt certificates expire every 90 days, making automated monitoring essential. Don't let an expired certificate take down your site—check your expiry status now.

**Methodology:** Certificate validity dates extracted via TLS handshake from 6 regions, calculating days until expiration.

Common SSL Errors & How to Fix Them

4 relevant issues

Browser shows "Your connection is not private" or NET::ERR_CERT_DATE_INVALID.

How to Fix

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.

certificate expiredcert date invalidconnection not private

Certificate expires within 30 days. Risk of service disruption if not renewed.

How to Fix

Start the renewal process immediately. For Let's Encrypt: run certbot renew --dry-run to test, then certbot renew. For other CAs: log into your account and initiate renewal. Deploy the new certificate before the old one expires.

expiring soonrenewal neededcertificate renewal

SSL works from some locations but fails from others. Common with CDNs and multi-origin setups.

How to Fix

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.

cdn certificateregional ssledge locationdifferent certificate

Connection fails before exchanging any data. May be regional or affect specific clients.

How to Fix

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.

handshake failuressl connection failedsni

See all SSL errors →

Frequently Asked Questions

4 relevant questions

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.

Set up automated monitoring to receive alerts 30, 14, and 7 days before expiry. ProbeOps offers free expiry alerts for registered users. You can also use certbot's built-in renewal cron job for Let's Encrypt, or configure your CI/CD pipeline to check certificate dates. Enterprise solutions like DigiCert offer dashboard notifications.

It depends on your certificate type. Let's Encrypt certificates expire every 90 days and should auto-renew via certbot. Traditional CA certificates (DigiCert, Comodo) last 1-2 years. Best practice: renew at least 30 days before expiry to allow time for troubleshooting. Enable auto-renewal where possible.

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.

See all SSL FAQs →

How to Check SSL Certificate ExpiryStep-by-step guide with examples and troubleshooting tips