ERR_SSL_PROTOCOL_ERROR in Google Chrome

A recurring error encountered by many on Chrome is the SSL protocol error. This error leads to a web page loading failure, and the error message ERR_SSL_PROTOCOL_ERROR is displayed. In case you have encountered this issue, this article is intended to help. The SSL protocol error occurs with SSL protected websites and is one of many SSL errors.

How to Fix ERR_SSL_PROTOCOL_ERROR in Google Chrome

There are other possible factors that can cause ERR_SSL_PROTOCOL_ERROR and based on each of the various solutions exist. Thus, the solutions described below are worth trying in order to fix the ERR_SSL_PROTOCOL_ERROR.

1. Clear Browsing Data

Accumulation of browsing data like cookies and cache is responsible for various problems. Clearing browsing data may thus fix the SSL protocol error. Following are the steps to do so:

Step 1: Open Chrome, and press Ctrl + Shift + Del.

Step 2: In the time range category, select All Time.

Step 3: Check the boxes next to the options Cookies and other site data and Cached images and files.

Step 4: Click Clear Data.

Clear Browsing Data to Fix ERR_SSL_PROTOCOL_ERROR

2. Correct Date & Time

Incorrect date and time settings of your system may cause Err_SSL_Protocol_Error. Incorrect date and time of the system may create complications regarding the authentication process of the SSL certificate. This is because certificates have expiration dates. Thus, the correct date and time should be set in the system. You can check and change it directly from the taskbar, or through the Control Panel.

3. Check Your Antivirus Settings

The Antivirus or Antimalware software in your computer regularly checks every online content for any threat. While it is intended to protect the system, it may often block websites even if they pose no threat.

In case the server is using an outdated version of SSL protocol, the system’s antivirus software or Firewall may block the SSL connection. Momentarily disabling the software may thus allow you to access the website. This, however, is not a permanent solution, as disabling your antivirus will put your system at risk.

4. Disable QUIC Protocol

Quick UDP Internet Connections (QUIC) is a counterpart of the SSL Protocol and is in the developing process. Still, in the experimental phase, QUIC is usually set as default in Chrome. Disabling QUIC may resolve the issue of SSL protocol error. Following are the steps to disable it:

Step 1: In the Chrome address bar, copy and paste “chrome://flags/#enable-quic,” then press Enter.

Step 2: Go to the Experimental QUIC Protocol, and selected Disabled option.

Disable QUIC Protocol to Fix ERR_SSL_PROTOCOL_ERROR

Step 3: Relaunch Chrome, and see if the Err_SSL_Protocol_Error has been rectified.

5. Enable All SSL/TLS Versions

There are different versions of SSL or TLS protocols. Out of this, many are obsolete, and thus, the browser not recognized by the browser. If any website is using an outdated SSL or TLS version, the connection will face authentication issues, and the error will occur, blocking the website.

However, enabling all versions of SSL and TLS in the browser may help to bypass the issue and establish a successful connection. To try this method, the following are the steps:

Step 1: Go to Internet Properties by navigating to Control Panel → Network and Internet → Network and Sharing Center → Internet Options.

Alternatively, open the Chrome menu and select Settings. Then navigate to Advanced options → System → Open proxy settings.

Step 2: In the Internet Properties window, go to the Advanced tab.

Step 3: Scroll down until you find the Security category. Under it, check the boxes next to all SSL and TLS versions listed. Then click Apply.

Step 4: Finally, relaunch Chrome and check if the Err_SSL_Protocol_Error has been rectified.

6. Clear Your SSL State

Another way to fix the Err_SSL_Protocol_Error is to clear the SSL state:

Step 1: Navigate to the  Control Panel. Then, choose Network and Internet.

Step 2: Select “Network and Sharing Center”.

Clear Your SSL State to Fix ERR_SSL_PROTOCOL_ERROR

Step 3: In the bottom left portion, click Internet Options.

Step 4: In the new window that will appear, go to the Content tab.

Step 5: Look for the “Clear SSL State” button and click on it. Then, press on OK.

Clear Your SSL State

Alternatively, you can use this method through Chrome. Follow the steps below:

Step 1: Click the three-dot menu icon of Chrome and select Settings.

Step 2: In the Settings window, select the “Advanced” option in the left panel, followed by System.

Step 3: Select the option “Open proxy settings,” after which the Internet Properties window should open. Then proceed as per Steps 4 and 5 in the previous way of clearing the SSL State.

Conclusion

The methods of resolving Err_SSL_Protocol_Error have been discussed. In case none of the methods yield any result, the problem might be with the server, which leaves no option but to wait. Among the given methods, the simpler ones mentioned towards the beginning should ideally work. Other methods, such as disabling Chrome extensions, may also work. Disabling the antivirus or enabling all versions of SSL, including outdated ones, are not safe options. So, use them as a last resort.

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