We recommend to disable (delete) third-party browser extensions, especially anonymizers, proxies, VPNs, antivirus extensions, and other similar add-ons that can interfere with traffic to the target website.
Restart your browser and check if the error ERR_SSL_PROTOCOL_ERROR persists. 
The message “ The SSL cache was successfully cleared” will appear. Go to Control Panel -> Internet Options. In Chrome, press Ctrl + Shift + Delete (or go to the address chrome://settings/clearBrowserData), select the time range ( All time) and click Clear data. We recommend to clear cache and cookies in your browser first. Clear Browser Cache, Cookies, and Reset SSL Cacheīrowser cache and cookies often cause an SSL certificate issues. Also check if you can open a problem website in other browsers: IE/Edge or Mozilla Firefox. Try to open from other devices (smartphone, tablet, home/work PC, etc.). I would like to note that despite Google Chrome, Opera, and Chromium-based browsers being released by different companies, they are using the same WebKit ( Chromium) engine, and the problem of opening HTTPS sites is solved in the same way for all of them.įirst of all, make sure that it is not the problem of the HTTPS website itself. Enable Support for Legacy TLS/SSL Protocols. 
Check the TLS/SSL Protocols Supported by Your Browser and Web Server.Clear Browser Cache, Cookies, and Reset SSL Cache.
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