TLS Certificate

A form of Digital Certificate for use in HTTPS found on the website’s origin server. TLS certificates contain:

• Website’s public key
• Certificate’s issued domain name
• Associated subdomains
• Expiration of certificate
• Digital Signature
• Which Certificate Authority issued it

Invalid Certificate

1. Check your time synchronization
2. Check your certificate lists
3. Check if another device and browser can access the site

Creating A Digital Certificate

1. Create public, private key pair with OpenSSH Keygen