How To Fix The Err_HTTP2_Protocol_Error Error (2024)

Have you ever visited a website only to be greeted with an error message that reads “Err_HTTP2_Protocol_Error”? It can be frustrating, right?

This error code indicates a problem with the way your web browser and the website’s server communicate with each other using the HTTP/2 protocol. But don’t worry, understanding and troubleshooting this error is easier than you might think.

In this article, we’ll explain what causes the Err_HTTP2_Protocol_Error and provide you with practical tips to fix it if you are running into it while trying to access a website. If you’re experiencing this error as a website owner, we’ll also cover practical steps to fix the Err_HTTP2_Protocol_Error for popular hosting platforms like cPanel, InterWorx, Plesk, DirectAdmin, as well as the Apache and Nginx web servers.

What Is The Benefit of Having HTTP/2 protocol?

The benefits of using the HTTP/2 protocol are significant for all websites, including those built with popular content management systems such as WordPress, Drupal, and Joomla. Some of the main benefits of using HTTP/2 include:

1. Faster page loading: HTTP/2 allows for the multiplexing of multiple requests and responses over a single connection, reducing the latency and improving the speed of page loading.
2. Improved performance: The header compression and binary framing features of HTTP/2 reduce the amount of data that needs to be transferred between the server and the browser, leading to improved performance and faster page rendering.
3. Better security: HTTP/2 requires the use of HTTPS encryption, which provides better security than the unencrypted HTTP protocol.
4. Increased efficiency: The server push feature of HTTP/2 allows the server to push resources to the browser before the browser requests them, reducing the number of round trips required between the server and browser and increasing efficiency.

Overall, using HTTP/2 can result in significant improvements in website speed, performance, and security, making it an essential technology for website owners and developers looking to provide the best possible experience for their users.

What is the Err_HTTP2_Protocol_Error Error?

The Err_HTTP2_Protocol_Error is typically caused by a problem with the HTTP/2 protocol, which is the latest version of the HTTP protocol used to transfer data between a web server and a web browser. It was designed to improve the performance of the web by addressing some of the shortcomings of its predecessor, HTTP/1.1.

Some common causes of this error include:

1. Incompatibility issues between the browser and the web server: The HTTP/2 protocol requires both the browser and the web server to support it. If either one of them doesn’t support the protocol or there’s an incompatibility issue, the Err_HTTP2_Protocol_Error may occur.
2. Outdated software: If you’re using outdated versions of your web server or web browser, they may not support the HTTP/2 protocol. This can cause the error to occur.
3. Misconfigured server settings: If the server settings are misconfigured, they may prevent the HTTP/2 protocol from functioning correctly, leading to the Err_HTTP2_Protocol_Error.
4. Network issues: Sometimes network issues, such as high latency or packet loss, can also cause the Err_HTTP2_Protocol_Error to occur.

By identifying the root cause of the error, you can take the necessary steps to fix it and prevent it from happening again in the future.

How To Fix The Err_HTTP2_Protocol_Error Error On Desktop

Here are the steps to fix Err_HTTP2_Protocol_Error for desktop browsers:

1. Google Chrome: Ensure that you’re using the latest version of the Google Chrome browser. Type in “chrome://settings/help” into the address bar to check for updates. If available, install them and relaunch Google Chrome. If you’re still encountering the error, try disabling your Google Chrome browser extensions. It’s possible you have conflicting browser extensions. Finally clear browsing data and cache.
2. Microsoft Edge: Ensure that you’re using the latest version of Microsoft Edge. Type in “edge://settings/help” into the address bar to check for updates. If available, install them. If you’re still encountering the error, try disabling browser extensions or clearing the cache.
3. Brave: Ensure that you’re using the latest version of Brave. Go to “brave://settings/help” to check for updates. If available, install them. If you’re still encountering the error, try disabling browser extensions or clearing the cache.
4. Opera: Ensure that you’re using the latest version of Opera. Go to “opera://about” to check for updates. If available, install them. If you’re still encountering the error, try disabling browser extensions or clearing the cache.
5. Safari: Ensure that you’re using the latest version of Safari. Go to the “Apple menu > System Preferences > Software Update” to check for updates. If available, install them. If you’re still encountering the error, try disabling browser extensions or clearing the cache.
6. Mozilla Firefox: Ensure that you’re using the latest version of Firefox. Go to “about:firefox” to check for updates. If available, install them. If you’re still encountering the error, try disabling browser extensions or clearing the cache.

By following these steps, you can fix the Err_HTTP2_Protocol_Error in desktop browsers and ensure that your website is accessible to users without any errors.

How To Fix The Err_HTTP2_Protocol_Error On Mobile

Here are the steps to fix Err_HTTP2_Protocol_Error for mobile browsers:

1. Google Chrome: Ensure that you’re using the latest version of the Google Chrome app. Go to the Google Play Store or Apple App Store to check for updates. If available, install them.
2. Safari: Ensure that you’re using the latest version of the Safari app. Go to the App Store to check for updates. If available, install them.
3. Samsung Internet: Ensure that you’re using the latest version of the Samsung Internet app. Go to the Google Play Store to check for updates. If available, install them.
4. Opera: Ensure that you’re using the latest version of the Opera app. Go to the Google Play Store or Apple App Store to check for updates. If available, install them.
5. Yandex Browser: Ensure that you’re using the latest version of the Yandex Browser app. Go to the Google Play Store to check for updates.
6. Brave: Ensure that you’re using the latest version of the Brave app. Go to the Google Play Store or Apple App Store to check for updates. If available, install them.

Regardless of which browser you use, it’s always a good idea to make sure extensions are also updated and clear cache. Extensions are a lot less common with mobile apps but always worth checking.

By following these steps, you can fix the Err_HTTP2_Protocol_Error in mobile browsers and ensure that your website is accessible to users without any errors.

Err_HTTP2_Protocol_Error Persisting In Google Chrome After Updating

If you’ve followed the instructions above to update Google Chrome, disable Chrome extensions and clear browsing data and cache as a last resort and you’re still getting the error, it’s possible you may have something wonky going on with your Google Chrome settings.

At this stage, I would recommend to factory reset Google Chrome or completely reinstall it. If you’ve used Google Chrome for years, gone through 10’s of browser extensions, and have months or years of browser cache, it’s hard to know what might have gotten screwed up over time.

To factory reset Google Chrome, simply uninstall it from your computer and and then navigate to the Google Chrome website and download it again. Now you know for sure that you have a fresh install of Google Chrome and hopefully you synced your bookmarks and logins to your Google account so you should be as good as new.

Err_HTTP2_Protocol_Error On Your Own Website?

If the Err_HTTP2_Protocol_Error is appearing on your website and not one of the web browsers mentioned above, you can try the following steps to fix it:

1. Check if your website is using HTTP/2: You can use online tools like KeyCDN’s HTTP/2 Test to check if your website is using HTTP/2. If not, you may need to enable it on your server or hosting provider.
2. Check your SSL/TLS configuration: Ensure that your SSL/TLS configuration is properly set up. You can use online tools like SSL Labs’ SSL Server Test to check the configuration.
3. Check for server-side issues: Check for server-side issues by checking server logs or contacting your hosting provider.
4. Update server software: Ensure that you’re using the latest version of the webserver. For example, if you’re using Apache, update to the latest version.
5. Disable HTTP/2: If all else fails, you can temporarily disable HTTP/2 on your website. However, this should only be a temporary solution until you’re able to fix the root cause of the error.

By following these steps, you can fix the Err_HTTP2_Protocol_Error on your website and ensure that it’s accessible to users without any errors.

NameHero can be a helpful partner in fixing the Err_HTTP2_Protocol_Error on your website. Their support team is available 24/7 to assist you with any issues that you may encounter, and they provide a variety of resources and tools to help you troubleshoot and fix this error.

Additionally, they offer a range of hosting solutions that are optimized for speed and performance, including HTTP/2 support, SSL certificates, and server software updates. By partnering with NameHero, you can ensure that your website is secure, fast, and accessible to users without any errors.