If you are having trouble with the err_ssl_protocol_error issue, we have some tips to help you out. ..

How to Fix err_ssl_protocol_error? 

Whenever you face any issue with a website, you should refresh the page and keep doing so until the error is fixed. However, it would barely resolve the issue, so you need to focus on a permanent fix to the error.

Google Chrome is not able to connect to the USB controller on your computer. This error message may appear when you try to watch a video on one of the specific websites that Google Cast support. To fix this issue, you may need to update your Google Chrome software or install a USB controller.

Method 1: Update the Date and Time of your System

If your system’s date or time is not correct as per your time zone, then you will face the issue.

Chrome Browser, and if the date or time is incorrect, then update it as per your time zone. Often, you would be prompted to adjust the date and time.

Method 2: Clear Search History

If your Chrome browser’s date and time are correct, browsing data interferes with your browsing functions, and you would face the SSL protocol error. So, to counterfeit it, you must clear your browsing history from Chrome.

To clear browsing data on Chrome, follow these steps:

  1. Open Chrome and click the three lines in the top right corner of the browser window.
  2. Click “Settings.”
  3. Under “Privacy,” click “Browsing Data.”
  4. In the “Browsing Data” window, click the “Clear Browsing Data” button. ..

Open Google Chrome on your computer. On the top right corner of the screen, you will see a three-dot icon; click on it. Navigate to History

To clear your browsing data:

  1. Under the Basic tab, click on the Clear Browsing Data button.
  2. In the Clear Browsing Data dialog box, check the Cookies and Site Data checkbox and press the blue colored button to clear data. ..

After Chrome clears your browsing data, then reload your website. If Browsing History were the cause affecting it, then another solution is also hidden in your browser settings.

Method 3: Clear SSL State

If you are still getting the “err_ssl_protocol_error” message, you need to clear your browser’s SSL state. ..

To clear the SSL state on your browser, follow these steps:

  1. Open your browser and go to the website you want to secure.
  2. Click on the lock icon in the top right corner of the browser window and select “Settings” from the menu that pops up.
  3. Under “Security”, click on “SSL” and then select “Clear SSL State” from the menu that appears. ..

Open Google ChromeNext to the address bar, you will see a three-dot icon, press on itNavigate to SettingsScroll down and clock on AdvancedNow, select the Advanced Settings optionIn it, navigate to SystemClick on Open Proxy SettingsInternet Properties section would launchNavigate to Content TabNow, click the Clear SSL State option and press the OK button.

Close Chrome and try to open the website again. ..

Method 4: Disable the QUIC Protocol 

If you are still having trouble clearing your SSL state, then you can disable the QUIC Protocol. Most of you might not know how to do it and thus seem like a daunting task, but it is easy!

  1. Open a command prompt and type “netstat -an” to see the network status.
  2. If the network is up, then you can continue. If not, then you need to disable the QUIC protocol.
  3. Type “netstat -a” to see all active TCP/IP connections on your computer.
  4. Look for the connection with the port 443 that is associated with QUIC protocol. The port number is listed in parentheses after the connection name, such as “TCP/IP:443”. The connection will be disabled if it exists but will be enabled if you change its port number to 443 from its original port number of 443.

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The Default buttonA list of options will open; click on Disabled to disable the QUIC protocol

Chrome reopened and checked if it worked.

Method 5: Temporarily Disable the Antivirus

If you’re having trouble with your Antivirus software, it might be because it’s not scanning your website properly. Most Antivirus software uses advanced technologies to check every website visited, but if your Antivirus isn’t up to date, it can cause problems.

If you’re visiting a website and the site’s security certificate is not up to date, your browser may display a warning message or refuse to open the site altogether. This is because older versions of SSL (Secure Sockets Layer) are less secure than newer versions. Antivirus software looks at the SSL version of websites you visit in order to decide whether or not to allow them to load. If the website uses an older SSL version, Antivirus will not allow it to load and will instead block it. ..

Disable the Antivirus program and you will need to re-enable it later.

Method 6: Check Firewalls 

If you use the Intranet or Extranet, you will have Firewalls active. Suppose you open a website that exists in a blocklist of Firewalls; then, it will stop Chrome from loading the website for you. In such a scenario, check the blocklist on Firewalls and remove the website if it is present and reload it.

Method 7: Disable the Extensions and Add-ons

Chrome allows the use of Extensions and Add-ons that enable you to extend the functionalities of browsers. However, these Extensions and Browsers can become a problem for you as they can cause errors like the err_ssl_protocol_error.

If you’re experiencing an issue with Chrome, disabling extensions one by one and reloading the page may help to fix it. After disabling an extension, if the issue is fixed, keep that extension disabled and enable others. For add-ons, use a similar approach: disable them one by one and reload the page to see if the issue is resolved. ..

If your computer is not working properly, you may have to fix its Internet Settings. Here’s how:

Method 8: Change your Internet Security and Privacy Levels

If your system has high Internet Security and Privacy levels, then it blocks several sites from loading on your system, resulting in the err_ssl_protocol_error.

To adjust your privacy and security settings on the Internet, follow these steps: ..

The Security Tab on the Internet Properties dialog box can be changed to make it more manageable. The slider can be set to a more reasonable value by moving it towards the middle.

Chrome should be opened and the website which was generating the err_ssl_protocol_error should be visited. The issue should now be fixed! ..

What is the reason for err_ssl_protocol_error?

The SSL certificate of the website is not valid.

Some Chrome Extensions or Add-ons are most likely to cause the issue.

What is a Website Protocol Error?

When you try to open a website, your browser may not be able to connect securely because of a problem with the website’s protocol. ..

The Final Word

SSLProtocolError: Protocol not supported