How to Fix Chrome Error ‘ERR_HTTP2_PROTOCOL_ERROR’

ERR HTTP2 PROTOCOL ERROR is a fairly common error that can happen on any browser, like Chrome, Edge, Opera, Firefox, and so on, though it happens most often on Windows 11 systems. HTTP2 is a new protocol that has replaced its predecessor, HTTP. It has a faster response time because it sends all the files in one packet to the server. ERR HTTP2 PROTOCOL ERROR can happen if the website you’re trying to visit doesn’t support the HTTP/2 protocol. This is often because the hosting is cheap or because the website’s administrator hasn’t turned on this protocol on the server.

This would be a good reason if you can’t get to a certain page. If that’s the only thing you’re having trouble with, it could be something more general like an old browser version, wrong date and time settings, browser add-ons that conflict with each other, a full cache, or even experimental features that cause connection problems. We’ve put together a list of things you can try that might fix the problem and get your browser working again. Note that the steps below are mostly about fixing the problem in Google Chrome, but you can use them to do similar things in other browsers as well.

Ways to Fix Chrome Error ‘ERR_HTTP2_PROTOCOL_ERROR’

Try in a New Browser Profile

1. Launch the Chrome browser and click your user profile icon in the top right corner (next to the three vertical ellipses).
2. Now click Add and select Continue without account.
3. Then enter the name of the new profile (e.g. Test) and click Done.
4. Now check in the window of the new user profile if the problematic website can be opened without any problems.

Disable the QUIC Protocol of the Browser

1. Launch the Chrome browser
2. Now find the Experimental QUIC protocol and set its drop-down menu to Disabled.
3. Then restart the Chrome browser and check if the problematic website loads correctly in the browser.

Clear Google Chrome’s Browsing Data

1. Launch Google Chrome
2. Press Ctrl + Shift + Delete
3. Set time range to All times
4. Check the box for “Cookies and other website data”.
5. Check the box for “Cached images and files“.
6. Click the “Clear data” button

Clear Your SSL State

1. Go to Start Menu > Control Panel > Network and Internet > Network and Sharing Center
2. Now click on Internet Options in the lower left corner.
3. or type Alt + T in Internet Explorer and select Internet Options
4. A new Internet Properties window will appear.
5. Now go to the Content tab and click Clear SSL Status.

Fix Settings of Your Installed Antivirus Software

Not always, but sometimes when you get an ERR SSL PROTOCOL ERROR, it’s because you have antivirus software installed. All antivirus Software on the market today scan the whole website for any malicious code or security risks, including any old SSL/TLS versions. For example, SSL 3.0 or TLS 1.0, which aren’t used anymore because of security problems.

Also, there is no one way to change the settings of your installed antivirus software because it depends on how the software is used. If you can find out from your antivirus software, make the change carefully and see how it goes. If the problem keeps happening, you may want to undo the changes you made in the settings menu.

Try Another Network or Use a VPN

1. If your device is connected through a VPN, first check if disconnecting the VPN or using a different VPN location fixes the problem.
2. If it doesn’t, disconnect the device from the current network and connect to another network (for example, a phone’s hotspot, but keep in mind that some websites actively block connections from a mobile network).
3. Now launch the browser and access the problematic website to check if it works properly.
4. If not, download a VPN app and install it on your device.
5. Now launch the VPN app and connect to a preferred location (e.g. the United States).
6. Then, launch the browser again and check if the problematic website can be accessed without any issues.

Why Chrome Error ‘ERR_HTTP2_PROTOCOL_ERROR’ Occur

The HTTP 2 protocol error can be caused by a number of things. Let’s look at what could be causing the error on your devices. you might get an HTTP 2 protocol error if you are using an old browser or operating system on your device. If this is the case, the error may be caused by the browser or device not working well with the website.

Second, you might be seeing the error screen because you have browser extensions that don’t work well together. In this case, it will be the browser’s extension that is messing with the server of the troublesome website and preventing it from loading properly on your end. The security protocol of the system or network could also be to blame. You might be seeing the error message because the security product is limiting your access to the web server. Because of this, the server won’t let you connect.

Final Words

So here we conclude our article on How to Fix Chrome Error ‘ERR_HTTP2_PROTOCOL_ERROR’. An HTTP2 Protocol Error can happen on a number of systems, and it usually has to do with the browser or the network. People run into this problem when their HTTP2 Network Protocol is being messed with, as the name suggests. This could happen if you have a broken or incompatible extension, bad cookies, or something else like that. If you are also getting the ERR HTTP2 PROTOCOL ERROR on your Chrome browser, you can visit Chrome support center for further help.