How to Fix “err_tunnel_connection_failed” in Google Chrome

The Google Chrome “err_tunnel_connection_failed” error message appears when the browser fails to establish a connection to your websites. You will need to check your connection settings and make the necessary changes to work around this issue. We’ll show you how to do that.

If you’re curious why the error occurs, it’s usually the result of a bad proxy server. However, there are also other reasons that can cause this problem with your favorite web browser.

Disable proxy to fix err_tunnel_connection_failed error

When Chrome encounters a proxy-related issue like your current one, disable your proxy server and see if that fixes the problem. You can disable your proxy feature from Control Panel and Settings. Here we will use the Parameters method.

  1. Launch Settings by pressing the Windows + I at a time.
  2. Select Network & Internet in the Settings window.
  1. Picking out Proxy in the sidebar on the left to access your proxy settings.
  2. Disable Automatically detect settings on the right.
  1. Switch off Use a proxy server as well.
  2. Launch Chromium and see if you can connect to your sites.

Your sites should load when you disable the proxy. But if you need to use a proxy server for some reason, contact your server team to resolve issues that cause Chrome to display an “err_tunnel_connection_failed” error message.

Reset your network stack

Your network configuration determines how your PC connects to the Internet. Suppose your network settings are having problems or are misconfigured. In this case, you will have to fix this to eliminate the connection error in Chrome.

One way to do this is to reset your entire network stack in Windows. This should resolve any issues with your network settings and your “err_tunnel_connection_failed” error will likely be resolved.

  1. Access Begin menu, search Command Promptand select Execute as administrator.
  2. Picking out Yes in the User Account Control fast.
  3. Enter the following command, one at a time, in the command prompt and press Walk in. Let each command take its own time to execute.

    ipconfig /release
    ipconfig /flushdns
    ipconfig /renew
    netsh int ip reset
    reset netsh winsock

  1. After running all these commands, restart your PC by opening the Begin menu, by selecting the Power icon, and choosing To restart.
  2. Launch Chromium when your PC restarts and try to open your sites.

Check if Chrome extensions are the culprit

Chrome lets you install various extensions to get the most out of the web browser. Sometimes these extensions come at a cost. This cost usually corresponds to the interference of the extension with the functioning of Chrome.

When this happens, Chrome encounters various issues, including “err_tunnel_connection_failed”. One way to work around these extension issues is to launch Chrome without extensions and see if your sites load. If so, one or more of your extensions is the culprit.

In this case, you can activate one extension at a time to finally find the problematic extension. You can then remove this faulty add-on to repair your Chrome browser.

  1. Open Chromiumselect the three dots in the upper right corner, then choose New incognito window.
  1. Load your sites in this private browsing window.
  2. If your sites are loading smoothly, your extensions are likely to blame. In this case, close Private Browsing and return to the normal Chrome window. There, select Chrome’s three-dot menu and choose More tools > Extensions.
  3. Disable all your extensions except one. Then try to open your sites. Keep activating one add-on at a time and eventually you will find the one causing the problem.
  1. You can remove the problematic extension by selecting Remove.

We understand that removing an extension means removing a feature from your browser.

The good thing is that the Chrome Web Store has plenty of extensions that you can use. You will probably find a good alternative to the extension you just removed. So, head to the store and check out the extensions available to use.

Change your DNS servers

Chrome may experience “err_tunnel_connection_failed” issue because your DNS servers are not working. These servers help your web browsers translate domain names to IP addresses, but your browsers can’t do that without a working server.

In this case, you can switch your current DNS servers to something more reliable, like Google’s public DNS servers. Here’s how to make this change on your Windows PC.

  1. Open Control Panel on your PC.
  2. Select Network and Internet > Network and Sharing Center.
  3. Picking out Change adaptation settings from the sidebar on the left.
  1. Right-click on your network adapter and select Properties.
  2. Underline Internet Protocol Version 4 (TCP/IPv4) and choose Properties.
  1. Activate it Use the following DNS server addresses option.
  1. Walk in in the Preferred DNS Server ground and in the Alternate DNS Server field. Then select OKAY basically.
  2. Launch Chromium and try to open your sites.

Clear browsing data in Chrome

Your past browsing data usually does not cause any problems with your web browsers. However, sometimes this data interferes with your current browsing sessions, causing issues like “err_tunnel_connection_failed”.

In this case, clear your Chrome’s old data and your error will likely be resolved.

  1. Type the following in the address bar of Chrome and press Walk in. This will open the dialog that allows you to clear your browser data: chrome://settings/clearBrowserData
  2. Select a time range to erase data from the Time interval scrolling menu. Then choose the type of data you are willing to give up and select Erase data.
  1. To restart Chromium when you deleted your browsing data and try to open your sites.

Update Google Chrome

Like all other apps, Chrome is not without its core issues. For example, your “err_tunnel_connection_failed” error may be the result of a system bug in Chrome’s code.

Updating your browser is the best way to fix issues like this. Google often releases bug fixes and other improvements to Chrome, and installing these updates can fix many problems with your browser.

Chrome updates are free, quick and easy to download. Here’s how.

  1. Launch Chromiumselect the three dots in the upper right corner, then choose To help > About Google Chrome.
  1. Chrome will automatically start checking for and installing the latest updates.
  1. Select Revive when you installed the updates for those updates to take effect.
  1. Open your sites with Chromium.

Fix err_tunnel_connection_failed by resetting Google Chrome

If your “err_tunnel_connection_failed” issue with Chrome still persists, try resetting your browser settings to defaults and see if that fixes the problem.

This method works because it returns all of your custom settings (even those specified incorrectly) to their defaults, thus fixing your network configuration and Chrome errors.

  1. Open Chromiumselect the three dots in the upper right corner and choose Settings.
  2. Select Advanced > Reset and Clean in the sidebar on the left.
  3. Picking out Restore settings to their original defaults in the right pane.
  1. Select Reset options in the box that opens.
  1. Revive Chromium when you have reset the settings, then launch your sites.

Chrome connection errors aren’t hard to fix

Chrome connection errors can seem intimidating the first time, but these errors are usually easy to fix. You can change a network setting here and there on your PC to fix most problems with your browser.

Once you fix the Chrome “err_tunnel_connection_failed” error using the above methods, you should be able to access your sites without any issues.

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