Learn how to resolve the ERR_TUNNEL_CONNECTION_FAILED error in Chrome. Our Cloudflare Support team is here to help you with your questions and concerns.

ERR_TUNNEL_CONNECTION_FAILED in Chrome

The ERR_TUNNEL_CONNECTION_FAILED error occurs if the browser cannot establish a secure tunnel connection to the website that we are trying to access. Interestingly, this error is specific to Google Chrome.

• Proxy server issues
• Firewall issues
• SSL certificate issues
• Malware or virus infections

Our experts have put together four different ways to resolve the issue. However, before we begin, it is recommended to clear the browser cache.

Check the Proxy Settings

1. First, we have to run the inetpl.cpl command in the command prompt to open the Internet Properties configuration window.
2. Next, click LAN Settings under the Connections tab.
3. Then, check the proxy settings. If it is disabled, enable it temporarily.
4. At this point, we have to check if the ERR_TUNNEL_CONNECTION_FAILED error occurs. If yes, we can try disabling the automatic proxy configuration as well as the manual setup. However, this means that we will be browsing the web without a proxy.

If the above solution does not work, try the next method.

Reset Internet Settings

1. First, open the command prompt and enter the following commands. Remember to press enter after entering each command.

   IPCONFIG /FLUSHDNS
NBTSTAT –R
NETSH INT IP RESET
NETSH WINSOCK RESET

   These commands will renew the system’s IP address as well as flush the local DNS cache.
2. Now, restart Chrome and check if the error reappears.

If the error persists, take a look at the next solution.

Change DNS Server

1. First, open the Network status screen and choose Advanced network settings.
2. Then click Change adapter options.
3. Next, locate our active network connection and right-click it. Then, select Properties.
4. Now, find Internet Protocol Version 4 (TCP/IPv4) and click Properties.
5. A new window pops open where we can configure the IP and DNS settings for the active internet connection.
6. In case the connection obtains the DNS server automatically, we have to switch to a public DNS. Additionally, we have to enter the server address to use a public DNS.
7. Then, refresh the Chrome browser to check if the ERR_TUNNEL_CONNECTION_FAILED error appears.

Reset Chrome Installation

1. First, head to the browser’s settings and choose the Reset and Clean up tab.
2. Then, click the Restore settings option and confirm.
3. Now, we have to wait for Chrome to restart.

This will resolve the ERR_TUNNEL_CONNECTION_FAILED error.

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Conclusion

In summary, our Support Techs demonstrated how to resolve the ERR_TUNNEL_CONNECTION_FAILED error in Chrome in 4 different ways.