Rules Presets / Block Lists and Allow Lists

Blocking Traffic from Specific Processes

With Fiddler Everywhere, you can create a rule that automatically blocks traffic from any matched processes by forcibly closing the ongoing HTTP connection.

Creating a "Block Traffic from Specific Processes" Rule

Create a "Block Traffic from Specific Processes" rule by setting the following actions through the Rules Builder.

  1. Create a matching condition that uses the "When all these conditions are met any number of times" pattern.

  2. Match by a Process where the string value defines the targeted process by its name. The process name varies depending on the used operating system and version of the client application.
    The example below matches different browsers on macOS while using the following regular expression: com.apple.webkit|chrome|msedge.

  3. Create a Close Non Gracefully action.

This sample Fiddler rule matches all sessions where the process contains one of the string literals set through the regular expression and closes the connection forcibly.

Creating "Block Traffic to Specific Processes" rule

The blocking actions are not final and can be combined with other actions. Learn more about final and non-final actions here.

Once the rule is created, enable the Rules tab, toggle the rule switch, and start capturing traffic.

Activating the "Block Traffic to Specific Processes" rule

Download a ready-to-use "Block Traffic to Specific Processes" rule as a FARX file, which you can import through the Rules toolbar.

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