If you receive This site can’t provide a secure connection, ERR_SSL_PROTOCOL_ERROR message when using Google Chrome on Windows 10, see this post.

Fix common SSL Connection errors in your Chrome, Firefox, Edge, etc, browser. Some of them can be fixed at your end while others need changes on the server.

Check if ERR_BAD_SSL_CLIENT_AUTH_CERT error still occurs. After following the solutions mentioned, you will successfully fix Google Chrome ERR_BAD_SSL_CLIENT_AUTH_CERT error in Windows 10.