Google Chrome ERR_TUNNEL_CONNECTION_FAILED: How to Fix It
Easy 10-30 minutes Medium Severity
Verified June 2026
- Error Code
- ERR_TUNNEL_CONNECTION_FAILED
- Brand
- Google Chrome
- Product Type
- browser
- Severity
- Medium
- DIY Difficulty
- Easy
- Estimated Fix Time
- 10-30 minutes
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Tools You'll Need
- Google Chrome browser (latest version)
- Windows Command Prompt (admin) or Mac Terminal
- Access to Windows Settings or Mac System Preferences
- Notepad or a plain-text editor (for hosts file check)
How to Fix Error Code ERR_TUNNEL_CONNECTION_FAILED
-
Disable or Check Your Proxy Settings
If you are on a corporate or school network, do not disable proxy settings without permission from your IT department — doing so may violate network policy. -
Disable VPN or Third-Party Proxy Software
-
Flush DNS Cache and Reset Network Settings
Running these commands will temporarily disconnect your internet — this is normal. Your connection will restore after restart. -
Clear Chrome's Browser Cache and Cookies
-
Reset Chrome Flags to Default
-
Disable QUIC Protocol in Chrome
-
Update or Reinstall Google Chrome
Back up your Chrome bookmarks before reinstalling by going to chrome://bookmarks and using the three-dot menu to Export bookmarks. -
Check Windows Hosts File for Tampering
Only remove lines you are confident are unauthorized. Deleting legitimate entries could break other software. If unsure, consult a tech professional.
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When to Call a Professional
If you have tried all steps above and the error persists only on your network but not on mobile data or another Wi-Fi network, the issue likely lies with your router, firewall, or ISP-level proxy configuration. Contact your Internet Service Provider or, for business networks, your IT department. If you suspect malware modified your hosts file or proxy settings, run a full malware scan or contact a professional cybersecurity technician. If the error appears on every network you try, a Chrome reinstall or OS-level network reset (factory network settings) performed by a computer technician may be required.Frequently Asked Questions
What causes ERR_TUNNEL_CONNECTION_FAILED in Chrome?
This error is caused when Chrome cannot establish a secure proxy tunnel to the destination server. Common causes include misconfigured proxy settings, an active VPN or proxy extension interfering with the connection, a corrupted DNS cache, malware that has altered network settings, or Chrome experimental flags that conflict with your network setup.
Does ERR_TUNNEL_CONNECTION_FAILED only affect certain websites?
It can affect just one website or all websites depending on the cause. If it only happens on a specific site, that site's server may be blocking connections from your IP range or proxy. If it happens on all sites, the problem is almost certainly in your local proxy, VPN, or network settings.
Will disabling my proxy fix ERR_TUNNEL_CONNECTION_FAILED?
In most cases, yes — disabling an incorrectly configured proxy is the fastest fix. However, if you require a proxy for your network (such as on a corporate or school network), you should not disable it. Instead, verify the correct proxy address and port with your network administrator.
Can a VPN cause ERR_TUNNEL_CONNECTION_FAILED?
Yes. VPN apps and browser-based VPN extensions are a very common cause of this error because they route Chrome's traffic through a proxy or tunnel. Temporarily disabling your VPN and reloading the page is one of the quickest ways to determine if it is the source of the problem.
Is ERR_TUNNEL_CONNECTION_FAILED a virus or security threat?
The error itself is not a virus, but malware can cause it by silently changing your proxy settings or editing your system's hosts file to redirect traffic through a malicious server. If the error appeared suddenly without you changing any settings, it is a good idea to run a full antivirus or malware scan using Windows Defender or a trusted third-party tool.