How to Fix ERR_HTTP2_PROTOCOL_ERROR?

What is ERR_HTTP2_PROTOCOL_ERROR?

This is most likely going to occur when your browser cannot connect to a website via the HTTP2 protocol. It can but does not always appear on any browser- let that be Chrome, Firefox, or Edge-on either single or all sites. The problem may also come into view in applications, such as Discord or any other gaming platforms.

Why Does ERR_HTTP2_PROTOCOL_ERROR Occur?

This might be due to older versions of software, interference of browser extensions with web servers, corrupted cookies or cache, and time or date settings on your device. The security protocols in your system also ban some sites, which might be one of the reasons for this error to occur.

Read about other Browser Errors:

ERR_CONNECTION_REFUSED Error

Status_Access_Violation Error

Fixing ERR_HTTP2_PROTOCOL_ERROR

Let’s go through some solutions to fix this error on your device.

1. Adjusting Time and Date Settings

The incorrect date and time settings can cause this error because web servers may have the ability to refuse connections whose timestamp is not correct.

1. Right-click the clock icon in the system tray area.
2. Click on Adjust Date and Time.
3. Under the option Set Time Automatically, click on the switch and set it to Off.
4. Now, set the Time Zone correctly and adjust the time and date manually.
5. Restart your PC. After that, check whether the issue has been sorted out or not.

2. Updating Your Browser

An outdated browser will not work appropriately with the HTTP2 protocol and hence will cause this error. Updating of your browser will resolve some compatibility issues.

1. Open Chrome and click on the Menu.
2. Now go to Help > About Google Chrome.
3. Check for updates if available, then install it.
4. Now restart your browser and open the website again.

Of course, there are some special tools, such as Outbyte PC Repair, which can help to fix this and other types of errors. Tools in this category enable the detection and subsequent repair of performance issues that may be affecting the functioning of your PC.

3. Updating Operating System

Some protocols may not work properly if your OS is out of date. Update the system to the latest version.

1. Click the Windows icon.
2. Search for Check for Updates.
3. In the new window, click the Check for updates.
4. If the system detects any updates, click on Install and restart your PC.

4. Using Incognito Mode

It will disable extensions besides bypassing cookies or cache which may be interfering with the proper working of the protocol.

1. Launch your browser.
2. Click the Menu and select New Incognito Window.
3. Go to the problematic website again.

If it is working now, then there might be an issue in your extensions or browser data.

5. Disabling Conflicting Extensions

Disable Extensions that Conflict Extensions can conflict with websites. Try disabling extensions if it had worked using Incognito Mode.

1. Open the Chrome browser and click the icon of Extensions, which is located besides the address bar.
2. Click on Manage Extensions.
3. Suspected extensions should have toggles off
4. Restart your browser and retry the site.

6. Resetting Advanced Experimental Settings

Sometimes modifying advanced browser settings can cause an issue. Reset the settings to default.

1. Open Chrome and in the address bar type chrome://flags/.
2. Click on Reset All in the upper right-hand corner.
3. Close your browser and re-open it to check if the HTTP2 protocol error has been cleared.

7. Switching to a New Browser Profile

Creating a new profile can resolve issues related to corrupted browser settings.

1. Click your User Profile icon in the browser.
2. Choose Add and proceed without an account.
3. Name your new profile and see if the issue persists.

8. Clearing Cache, Cookies, and History

Corrupt cache or cookies can block your connection to certain sites. Clearing them can fix this issue.

1. Open Chrome.
2. Go to More Tools > Clear Browsing Data.
3. In the Advanced tab, select the time range for All-Time and put a check mark next to every category.
4. Clear Cache, Cookies, and History. In the address bar, click the padlock icon and choose Cookies. Select a cookie and press the Remove button.
5. Relaunch the browser and try the website again.

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