This is typically due to a cached ssl state or misconfigured certificate. Usually, that happens when the browser has trouble using the ssl (secure socket layer) protocol to establish a secure connection with the site. Err_ssl_protocol_error often indicates an expired, revoked, or improperly installed ssl certificate
Whether you are the site owner or just trying to load a website, you can check a website's ssl certificate using qualys's ssl server test. Do you keep seeing err_ssl_protocol_error repeatedly while attempting to access a website or web page in google chrome Clear cache, check ssl, and update your browser for a quick fix.
