Fixed ERR HTTP2 inadequate transport security error in Google Chrome


This article explains how to repair ERR HTTP2 Inadequate transport security error in Google Chrome. Many users have encountered this error message while connecting to CA server over HTTPS in Google Chrome browser. This happens due to some security settings.

Before talking about the solutions, let’s find out the reasons and scenarios that can trigger this error in Chrome.

What are the causes of ERR_HTTP2_Inadequate_Transport_Security error in Google Chrome?

Here are some of the potential causes for triggering ERR_HTTP2_Inadequate_Transport_Security error in Chrome:

  • This error could be caused by using an outdated version of Chrome. With the old version of Chrome, your browser must be missing various new security mechanisms essential for establishing CA connections, and therefore this error message. If this scenario applies to you, a simple update to the latest version of Chrome will resolve the issue.
  • Some old and corrupted browser cookies can also cause this error message in Chrome. In this case, you can simply clear all cookies for that particular connection that generated this error message.
  • Another reason may be that HTTP / 2 is enabled. It’s good for security but has more stringent requirements. Windows Server 2016 tends to fall back to HTTP / 1.1, which can cause this error message.
  • If your Windows server uses weaker ciphers and protocols, this error message may be triggered because of it.

Now that you know the scenarios that trigger this error message in Chrome, let’s discuss the fixes to fix the problem.

ERR_HTTP2_Inadequate_Transport_Security error in Chrome

Here are the main methods you can try to fix ERR_HTTP2_Inadequate_Transport_Security error in Google Chrome:

  1. Delete Chrome cookies.
  2. Update Chrome to the latest version.
  3. Disable HTTP / 2 on Windows Server.
  4. Disable weak cipher suites.

Now let’s talk about the above solutions in detail.

1]Delete Chrome cookies

As we have seen above, cookies stored on your Chrome browser can be the cause of the ERR_HTTP2_Inadequate_Transport_Security error. This error message is common when connecting to a CA server over HTTPS on Windows Server installation. Now you can check if this error is due to bad cookies by making the same connection in an incognito tab.

To do this, launch Google Chrome and click on the three-dot menu icon present in the upper right corner. Then click on the New incognito window option to launch the incognito tab. Now try to login to the same portal that gave you this error and see if the error message is still showing. If you don’t get this error in incognito mode, you can be sure that the issue is triggered due to bad or corrupt browser cookies, and you will need to delete cookies from Chrome. However, if the error persists in incognito mode, you can skip this method.

To fix the ERR_HTTP2_Inadequate_Transport_Security error, you can try to delete the wrong dedicated cookie by following the steps below:

  1. First of all, launch the Google Chrome browser and try to load the page that triggered this error from the address bar.
  2. Now in the address bar click on the lock icon present next to the connection URL.
  3. Then you will see various menu options from which you need to press the Biscuits option.
  4. After that, go to the Allowed tab in the Cookies menu.
  5. Then select each of the cookies and click on the Delete button to delete all the bad cookies one by one.
  6. Once you are done deleting all possibly corrupt and bad cookies, close Chrome and then relaunch it.

Now check if this error is fixed or not. Otherwise, try another fix from this list.

See: Fix Chrome Won’t Open or Launch on Windows 11/10 PC

2]Update Chrome to the latest version

You should also make sure that you are using the latest public version of Google Chrome to avoid this error. If you are using an older version of Chrome without the new security mechanisms, you may receive this error. Some users reportedly fixed this problem by updating their Chrome to the most recent update. You can go to the three-dot menu and click on the Help> About Google Chrome option. Then check for available updates, install the latest updates, and restart your web browser.

However, it is recommended that you completely uninstall Chrome browser using a free uninstaller which can also remove leftover and leftover files. After installing Chrome, download the latest version of Chrome from its official website and then run the installer to install the browser on your PC. Once the Chrome installation is complete, check if the ERR_HTTP2_Inadequate_Transport_Security error persists while logging into the portal that gave you this error.

3]Disable HTTP / 2 on Windows Server

Are you receiving this error after upgrading IIS web server to Windows Server? Then the error can be caused because by default Windows Server enables HTTP / 2 and can revert to HTTP / 1.1 if HTTP / 2 is not supported. So you can try disabling HTTP / 2 on Windows Server to resolve the issue. However, this could be a compromise on security. So, only do this if it’s too necessary.

If you are sure to disable HTTP / 2 on Windows Server and make this tradeoff, you can do so by manually creating a registry file. here are the steps to do it:

  • First, open the Notepad application on your PC with administrator privileges; Find Notepad in the search box, and then right-click the Notepad app and select the Run as administrator option.

Now in Notepad type the code below:

Windows Registry Editor Version 5.00

After writing the code, go to the File menu and click on the Save As option.

Then select the Save As type in all files, enter a file name with the .reg file extension and click save button to save the registry file.

Now right click on the created registry file and then in the context menu click on the Run as administrator option and confirm to run the registry script.

Finally, restart the Windows Server installation to save the changes and go back to Google Chrome and see if you still get the error.

To note: If you decide to enable HTTP / 2 in the future, you can create a new registry file by following the steps above, but just make sure to use the script below:

Windows Registry Editor Version 5.00

Read: Fix ERR_FILE_NOT_FOUND error on Google Chrome

4]Disable Weak Cipher Suite Using IIS Crypto

You can also try disabling weaker cipher suites in order to fix this error in Chrome. To do it without hassle and noise, you can use this free tool called IIS Crypto. This is free software that allows you to enable or disable ciphers, protocols, hashes, and key exchange algorithms on Windows Server 2008, 2012, 2016 and 2019 with just one click.

You can download this software to your PC and then launch this application. It is portable, so does not require any installation. After starting this software, click on the Cipher suites menu on the left panel then press the Best practices button. This will disable cipher suites and weaker protocols and force your server to use best practices for TLS. Advanced users can manually select / deselect weaker cipher suites accordingly. To save the changes, click the Apply button and restart your PC. This will disable all the weakest ciphers and ensure that you are using secure protocols on your Windows server.

See if this method works for you and gets rid of the error in Chrome.

How to fix the Chrome installation error?

If you receive a Chrome installation error, there are a few common fixes you can try to fix it. Check your internet connection and make sure you are connected to a stable connection. If there are lag or connectivity issues with your connection, you may experience a Chrome installation error. Also, make sure that your device meets the system requirements. You can also download a new installer file for Chrome and then attempt to install the browser using the new file. If that doesn’t help, you can use an offline installer to install it.

If you receive a particular error code while installing Chrome, here are some guides that will help you fix them:

How to fix out of memory error in Chrome?

If you encounter a Google Chrome ran out of memory error message, you can fix it by clearing the cache, closing all instances of Chrome and restarting the browser, or removing extensions. If that doesn’t help, you can try creating a new user profile and check if the issue is resolved.

That’s it!

Now read:

Fix ERR_HTTP2_Inadequate_Transport_Security error in Google Chrome

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