Software⏱️ 3 min read📅 2026-06-19

How to Fix: Fiddler possible error maybe with LAN

Fiddler error with LAN connection in Windows

Quick Answer: Try disabling and re-enabling the proxy server for your LAN settings in Fiddler's configuration.

📋 Table of Contents

  1. 💡 Why You Are Getting This Error
  2. 🚀 How to Resolve This Issue
  3. 💡 Conclusion

The issue described is related to Fiddler, a popular web debugging proxy tool. The user reports that after enabling LAN settings in Internet Options, their internet connection works again but Fiddler is no longer functional. This error affects users who rely on Fiddler for debugging purposes, such as testing Facebook games.

This problem can be frustrating for developers and power users who heavily depend on Fiddler's features. Fortunately, this guide will walk through the steps to resolve the issue.

💡 Why You Are Getting This Error

  • The primary reason for this error is that enabling LAN settings in Internet Options disables the proxy server for local networks. This means that when you use a proxy server with Fiddler on your local network, it may not work as expected.
  • Another possible cause could be a conflict between Fiddler and the operating system's proxy settings.

🚀 How to Resolve This Issue

Enabling Fiddler's Proxy Settings

  1. Step 1: Step 1: Open Fiddler and click on 'Edit' in the top right corner, then select 'Preferences'.
  2. Step 2: Step 2: In the Preferences window, navigate to the 'Proxies' tab and ensure that 'Use a proxy server for your LAN' is enabled.
  3. Step 3: Step 3: Click 'OK' to save the changes and restart Fiddler. This should enable Fiddler's proxy settings and resolve the issue.

Disabling LAN Settings

  1. Step 1: Step 1: Open Internet Options by pressing Alt + I on your keyboard, then clicking on 'Connections' in the top left corner.
  2. Step 2: Step 2: Click on 'LAN Settings' and ensure that 'Use a proxy server for your LAN' is disabled. Click 'OK' to save the changes.

💡 Conclusion

By following these steps, you should be able to resolve the issue with Fiddler not working after enabling LAN settings in Internet Options. If you are still experiencing problems, try restarting your computer or reinstalling Fiddler.

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