Clear cache, check ssl, and update your browser for a quick fix. Following the nine practical solutions presented in this guide works for resolving err_ssl_protocol_error on chrome as well as android systems, and localhost platforms Err_ssl_protocol_error often indicates an expired, revoked, or improperly installed ssl certificate
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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.