PKI manages digital certificates and public-key encryption for secure information transfer. Certificate authority (CA) issues and signs digital certificates. Registration authority (RA) verifies entity requests for certificates. Central directory stores and indexes keys securely
TLS encrypts client-server communications using public-key cryptography. Servers use Certificate Authorities (CAs) to issue trusted certificates. Android 8.0 includes over 100 CAs that don't change between devices
Edge displays "Can't connect securely to this page" error on some websites. Error occurs even with HTTPS protocol websites. Issue arises from outdated or unsafe TLS security settings
Error occurs when browser and server fail SSL/TLS handshake. Indicates browser and server are incompatible with SSL protocol version. Prevents secure connection between browser and web server
Error occurs when service is unavailable on remote machine. Can be caused by firewall blocking port. May result from proxy server interference. Can happen due to outdated TLS protocol versions
Error occurs when browser and server don't agree on encryption protocols. SSL/TLS creates encrypted tunnel between browser and server. Error indicates mismatch between browser and server's TLS versions