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Google Chrome is a popular web browser. Most people use it as a default browser on their computers. But, no matter how popular it is, the Google’s Chrome browser is still not entirely secure from some errors.

If you’re a Chrome user, you might have come across the errors, like “err_spdy_protocol_error” while browsing the website.

The err_spdy_protocol_error is a most common Chrome error experienced by users all over the world, and it can be solved quickly.

In this article, we’ll discuss some easy solutions to fix the err_spdy_protocol_error in Chrome. Before starting, let’s see more about the error and what is it caused by.

What is ERR_SPDY_PROTOCOL_ERROR on Google Chrome?

You might have experienced this error while browsing your favorite social sites like Facebook, Tumblr, and Reddit and others.

Instead of getting the regular webpage, the Error Code: ERR_SPDY_PROTOCOL_ERROR shows up. So, what does it mean?

The SPDY protocol was designed to handle the security of the web pages. It is also used to enhance the loading speed of the websites. When the error occurs, it means that Google is not supporting to the SPDY protocol.


The SPDY protocol is mostly associated with HTTPS enabled websites, and the following might cause such errors:

  • Firewall and Antivirus blocking
  • Outdated Google Chrome browser


Well, the error is mostly associated with network issues; thus, it can be resolved quickly. Following are the methods to fix ERR_SPDY_PROTOCOL_ERROR

#1: Clearing Cookies

If the error is due to some security issues, then it might be caused by the presence of cookies on your web browser. Follow the below steps to clear your cookies.

  • Go to the Settings on your chrome browser
  • Select the History tab
  • Click on Browsing Data tab
  • From the pop-up box, tick on Cached Images and files, and on Cookies and other site and plug-in data
  • Then click on clear browsing data

#2: Flush Your Systems DNS Cache

To resolve the problem of the webpage not available SPDY protocol error, flush the DNS cache from your PC. To do this, follow the below procedure.

  • If you are operating from a windows PC, Open the Command prompt, in case of Linus, open Terminal.
  • Windows users type the following in command prompt:
    • Ipconfig/flushdns
    • Ipconfig/release
    • Ipconfig/renew
  • Linux users type the following command in the terminal:
    • nscd-l hosts

The above steps should help you clear your cache. You can now try visiting the website.

#3: Flush Sockets

You can use these two methods to flush sockets.

  • Open your Chrome browser and type in or copy-paste the following URL to open and Flush Sockets

  • From the Chrome browser, visit the following link and click on the Flush Sockets Pool button to get rid of the error
Chrome: //net-internals/#sockets

From the top right corner, of the screen, click on the drop-down arrow and click on “Flush Sockets.”

Try to reload the page you were trying to visit.

#4: Update Google Chrome Browser

An outdated Google Chrome is one of the most common causes of err_spdy_protocol_error.

If this is the case, then you need to download the updated version of your all-time browser. Visit the Google Chrome official site and download the browser.

#5: Check Firewall and Antivirus Settings

Blocking set by the antivirus and firewall installed on your PC might cause the err_spdy_protocol_err. You need to check whether the firewall is creating a block or not.

Most people using Avast Security Software commonly face this problem with individual websites. You can add the blocked sites through the Web Shield exclusion of the antivirus.

Visit this link to disable your avast antivirus temporarily.

To add the blocked sites on Avast, follow these steps.

  • Navigate to the settings of AvastSecurity Software.
  • From the active protection tab, click Customize Web Shield Protection.
  • Add the required website to this section, each at a time.

Note: While trying to add the sites, ensure that the URLs are correct otherwise, the problem will not be resolved.

#6: Use Chrome Cleanup Tool

You can solve the SPDY protocol error by running the Chrome Cleanup tool.

Go to:

Download and run the cleanup tool to fix the issues with your Google Chrome browser. After cleaning, check if the err_spdy_protocol_err problem is resolved by reloading the website.

The above methods are proven and will help you solve the err_spdy_protocol_error. If not all the mentioned methods helped you out, then you can uninstall and reinstall your browser back again.

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