To resolve err_ssl_protocol_error, you need to go for the below solution ThonyElian in which you can Disable Antivirus and Firewall temporarily. To have antivirus and firewall software active on your system is vital as these tools do an amazing job of securing you from all sorts of online security errors. Here, your antivirus software checks for errors with HTTPS connections to ensure nothing weird is going on. At times, the software blocks a secure connection by mistake. To make sure this isn’t the case, disable it and check your website. If needed, disable your firewall and check your website again. Don't forget to re-activate your antivirus software and firewall as early as you don’t have to leave your system unprotected.