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Fiddler and Microsoft Firewall Client

Configuration Conflict

Microsoft Firewall client for Microsoft ISA 2004 has an option to automatically reconfigure Internet Explorer settings. Unfortunately, this setting will cause Internet Explorer to detach from Fiddler at random times. To prevent this problem, disable browser automatic configuration in the Microsoft Firewall client.

  • If there's a Firewall Client icon in your system tray, right click it and choose Configure... from the popup menu
  • If not, type firewall in the Start Menu search box and choose the Microsoft Firewall Client Management icon

On the Web Browser tab, uncheck the checkbox.

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