Fiddler not capturing Visual Studio IE localhost session, but captures all other traffic.

[Chris Porter]

My current situation is this:

1. Fiddler will capture all non-localhost traffic from any browser

2. Fiddler will capture localhost traffic on chrome

3. Fiddler will not capture any localhost traffic on IE, but instead captures dc.services.visualstudio.com requests (which I think is related to app insights)

4. When I go to http://localhost:8888/ I get the fiddler echo service page as expected.

5. I have only had this problem for about 1 week - before that I could capture ie localhost traffic only if I was connected to our company vpn (I work remotely)

My application consists of 2 visual studio solutions a front end website and an api that talk via ajax calls. (localhost:xxxx calls localhost:yyyy) for data

Both solutions use https

[EricLaw]

You haven't mentioned which version of IE you have installed?

Inside Tools > Fiddler Options > Connections, does the Bypass Fiddler for URLs box contain the string <-loopback> (it should).

VPNs are potentially tricky insofar as some of them do "unnatural" things to network routing; for instance, Microsoft DirectAccess has code inside WinINET itself which can cause WinINET to ignore the configured proxy regardless of any user-controllable configuration choices.