When you open a webpage on Chrome or another browser, the browser will send an HTTP request to the origin server hosting the website.
If the network administrator or ISP blocks the request from the browser, ERR_TUNNEL_CONNECTION_FAILED. Indicates that the requested website is unavailable due to temporary failure or permanent relocation.
Clear browser cookies and cache data
Sometimes, the browser cache and cookies may block the connection and display this error. This allows you to delete cookies and browser history that can solve this problem.
Just open your Google Chrome browser, then copy and paste the following offers into the search bar. Press the Enter key on the keyboard.
Chrome: //Settings/Cookies
Now click the "Delete All" button above, and then click the "Finish" button in the lower half.
You can also delete browser data by following the steps below. Open the Chrome browser again, then copy and paste the quote below into the search field and press Enter.
Chrome: //Settings/clearBrowserData
Select the entire check box and click the "Clear Navigation Data" button. After completing these steps, close the browser and reopen it to check for errors.
Set a new DNS server address
In most cases, Google Chrome automatically connects to the DNS server and uses the service to resolve IP addresses without problems. However, if you encounter obstacles, the error ERR_TUNNEL_CONNECTION_FAILED may occur.
If the DNS address specified by the Internet service provider cannot resolve the address correctly or is incompatible with the proxy server, configuring a new DNS server address can solve this problem. One of the most reliable methods is to use Google's DNS server address.
To configure Chrome to resolve DNS requests through Google’s DNS servers:
- Open the "Network" menu in the Windows taskbar. This is the same menu you normally use to connect to Wi-Fi. Right-click, and then click Open Network and Sharing Center.
- In the window that opens, click "Show Active Networks." Click on the network you are currently connected to.
- In the "Internet Connection Status" window, click "Properties".
- Go to the "Network" tab and look for Internet Protocol version 4 (TCP/IPv4) in the list of items used by the connection. Double-click it.
- In the result window, the Automatically obtain DNS server address check box may be selected.
- Disable this option and enter the following two addresses:
Preferred DNS server: 114.114.114.114
Alternate DNS server:
Enable the "Check output settings" option and click "OK". Restart your computer.
If you configure Google Chrome to use Google's DNS server to search for IP addresses, you can avoid compatibility issues between browsers, proxy services, and the DNS search process. Google servers should be available for most proxies, but if not, you need to use a better proxy.