Quick Summary
The "ERR_TUNNEL_CONNECTION_FAILED" error in Chrome indicates that your browser is unable to establish a connection through the proxy server you're using to reach the website. This often points to issues with the proxy server itself, your network configuration, or firewall settings.
Common Causes of Error ERR_TUNNEL_CONNECTION_FAILED
- Proxy Server Issues: The proxy server you are configured to use might be down, overloaded, or experiencing technical difficulties. A faulty proxy can prevent your browser from properly establishing a connection to the internet.
- Incorrect Proxy Configuration: Your browser or system might be configured to use a proxy server that is no longer valid or configured incorrectly. This could be due to a typo in the proxy settings or an outdated configuration.
- Firewall Interference: A firewall on your computer or network might be blocking the connection to the proxy server. This is especially common in corporate networks with strict security policies.
- Network Connectivity Problems: General network connectivity issues, such as a problem with your internet service provider (ISP) or a faulty router, can prevent your browser from reaching the proxy server.
- Antivirus Software Interference: Some antivirus software can interfere with network connections, including proxy connections. Its real-time scanning or web protection features might be misinterpreting the proxy connection as a threat.
Step-by-Step Fixes
Method 1: Check Proxy Settings in Chrome Show Steps ›
Step 1: Open Chrome's settings by typing chrome://settings in the address bar.
Step 2: Search for "proxy" in the settings search bar.
Step 3: Click on "Open your computer's proxy settings".
Step 4: Depending on your system, you'll see options to configure proxy settings.
Step 5: If you're not supposed to be using a proxy, ensure that the "Use a proxy server" option is disabled (or set to 'Automatically Detect Settings').
Step 6: If you are supposed to be using a proxy, double-check the proxy address and port number for accuracy. Contact your network administrator if you are unsure of the correct settings.
Method 2: Disable Proxy (If Not Required) Show Steps ›
Step 1: Open Chrome's settings (chrome://settings).
Step 2: Search for 'proxy' and open computer's proxy settings.
Step 3: Find the Proxy settings, and disable "Use a proxy server for your LAN" (or similar wording depending on OS). Ensure 'Automatically detect settings' is enabled.
Step 4: Restart Chrome to apply the changes.
Method 3: Check Firewall Settings Show Steps ›
Step 1: Open your operating system's firewall settings (search for "Firewall" in your system's search bar).
Step 2: Ensure that Chrome (or the proxy server, if applicable) is allowed to communicate through the firewall.
Step 3: You may need to add Chrome as an exception if it's being blocked.
Step 4: Temporarily disable the firewall to see if that resolves the issue. If it does, you'll need to configure the firewall to allow Chrome and/or your proxy server to function correctly.
Method 4: Restart Your Router and Modem Show Steps ›
Step 1: Unplug your modem and router from the power outlet.
Step 2: Wait for about 30 seconds.
Step 3: Plug the modem back in and wait for it to fully power on.
Step 4: Plug the router back in and wait for it to fully power on.
Step 5: Try accessing the website again.
Method 5: Disable Antivirus Temporarily Show Steps ›
Step 1: Temporarily disable your antivirus software.
Step 2: Try accessing the website again.
Step 3: If the issue is resolved, configure your antivirus software to allow Chrome and/or your proxy server to access the internet without interference. Consult your antivirus software's documentation for instructions on how to create exceptions.
Step 4: Remember to re-enable your antivirus software after testing.