Wrong date or time (or time zone) on your computer also can cause secure connection errors for HTTPS websites.

The integrated firewall ( Spider Gate) can block website in Dr.Web antivirus.

In Avast the appropriate option is called “ Enable HTTPS scanning” (it is located in Settings -> Active Protection -> Web Shield -> Customize -> Main Settings).

Disable the “ Enable SSL/TLS protocol filtering” option in the ESET NOD32 Antivirus.

As you can see, it depends on your antivirus. If an antivirus detects that the website is using an insecure (or self-signed) certificate or an outdated SSL protocol version (SSL v3 or earlier), the antivirus may block the user’s access to such a site. Many anti-viruses by default have a built-in module that checks the SST/TLS certificates of websites. To understand if your antivirus or firewall block access to a site, try to pause them for a while. If you have an antivirus or a firewall (it is often built into the antivirus as a module) installed on your computer, they may block access to these websites. You can view the list of enabled Chrome extensions in Settings -> More Tools -> Extensions or go to chrome://extensions/. 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 SSL Cacheīrowser cache and cookies often cause an SSL certificate issues. Also check if you can open 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 are released by different companies, but they are using the same Chrome 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.

Clear Browser Cache, Cookies and SSL Cache.

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