How to Troubleshoot ERR_SSL_PROTOCOL_ERROR on Windows and Mac
Few browser errors feel as unhelpful as ERR_SSL_PROTOCOL_ERROR. One moment you are opening a website as usual; the next, Chrome or another browser refuses to load the page and tells you that a secure connection could not be established. The good news is that this error is usually caused by something practical: an incorrect system clock, cached SSL data, browser settings, antivirus inspection, or a misconfigured website certificate.