Common SSL Errors and What They Mean
NET::ERR_CERT_DATE_INVALID - Certificate expired
NET::ERR_CERT_AUTHORITY_INVALID - Untrusted CA
NET::ERR_CERT_COMMON_NAME_INVALID - Domain mismatch
Mixed Content - HTTP resources on HTTPS page
How to Fix Each Error
Expired Certificate:
1. Renew with your CA or Let's Encrypt
2. Install the new certificate
3. Update auto-renewal settings
Chain Issues:
1. Download intermediate certificates
2. Install in correct order
3. Test with SSL checker
Mixed Content:
1. Find HTTP resources in source
2. Update to HTTPS or use protocol-relative URLs
3. Add upgrade-insecure-requests CSP
Test Your Fix
After making changes, use our free SSL checker to verify your certificate is properly configured.