ERR_SSL_VERSION_OR_CIPHER_MISMATCH error shows in your web browser when the browser cannot establish secure connection with the web server. SSL certificates are common theses days as they provide secure and encrypted connection between a website and a web browser. SSL certificates are used in situations when you need to encrypt sensitive data like credit card numbers and personal information so you can accept payments securely, data transfers, web form logins etc. But today the SSL certificates are becoming standard protocol for any website, and Google is pushing all webmasters to implement SSL certificates on their websites. Today we will show you how to fix ERR_SSL_VERSION_OR_CIPHER_MISMATCH error.