Other causes for this issue include network connectivity problems, a corrupted browser cache or cookies, or interference from firewall or security software. It’s crucial for users to ensure their internet connection is stable and that the proxy settings are correctly configured. Users should also consider clearing their browser cache and cookies, disabling any interfering firewall or security software temporarily, and checking for any incorrect proxy settings as initial steps towards resolving this error. In this guide, we will show you several methods you can use to resolve the ERR_PROXY_CONNECTION_FAILED error code with relative ease.
1. Disable Automatic Proxy Detection
The first thing you should do is disable the automatic detection of proxy settings in Windows. This prevents unintended changes to the proxy settings on your PC in case you have configured any.
2. Reset DNS Cache
An inconsistency in the DNS cache can also cause your computer’s proxy server to stop working, usually when your PC can’t reach the proxy server because the DNS server is unable to resolve the request. Resetting the DNS cache may help to isolate the issue.
3. Disable Third-Party Extensions
Third-party extensions added to your web browser can trigger the ERR_PROXY_CONNECTION_FAILED error code, especially when using a VPN-like extension. These services change your browser’s proxy settings to enable their use. To solve this problem, try disabling the third-party extension. You can verify if the problem persists without third-party extensions by opening an incognito or private window in your browser, as extensions are usually disabled in this mode. If the problem is resolved, find the problematic extension with these steps:
4. Reset TCP/IP Stack
The Transmission Control Protocol (TCP) and Internet Protocol (IP) are essential for communicating with other devices on the internet. A damaged TCP/IP stack in Windows could lead to the ERR_PROXY_CONNECTION_FAILED error code. Resetting the TCP/IP stack may correct this issue.
5. Remove Proxy Settings
If you encounter the ERR_PROXY_CONNECTION_FAILED error without intentionally adding a proxy server to your PC, it’s possible that a third-party app has injected proxy settings. Alternatively, if the proxy server you use is experiencing an outage, removing the proxy settings may resolve the issue. Below are two methods for removing a proxy server from your PC. Be aware that not all proxy settings may be reflected in the Settings app, requiring you to use the Windows Registry.
5.1. Using the Settings App
5.2. Using the Windows Registry
6. Reset Browser Settings
If none of the above methods fix the error code, consider resetting your browser. At this point, a browser configuration inconsistency is likely causing the issue, and a reset should address this.
