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When using Fiddler to monitor HTTP Requests & Responses in Internet Explorer it ignores all traffic directed to http://localhost.
When using Fiddler to monitor HTTP Requests & Responses in Internet Explorer it ignores all traffic directed to http://localhost.
Fiddler's website addresses this question directly.
There are several suggested workarounds, but the most straightforward is simply to use the machine name rather than "localhost" or "127.0.0.1":
http://machinename/mytestpage.aspx
Windows XP:
Be sure to set to click the settings button for each of the items in the "Dial-up and Virtual Private Network settings" listbox in the "Connections" tab of the "Internet Options" control panel applet.
I noticed that Fiddler would stop using the "LAN settings" configuration once I connected to my VPN. Even if the traffic wasn't going through the VPN.
Go to Tools, Fiddler Options ..., select the Connections tab, then make sure Monitor all connections is ticked. Like Antony Scott said, but also make sure that the "Web Sessions" pane is set to "Capturing" and [ "Web Browsers" OR "All Processes" ]. Looks like the default is "Non-Browser".