Running fiddler blocks all http traffic

3 posts, 0 answers
  1. Craig
    Craig avatar
    2 posts
    Member since:
    May 2015

    Posted 19 May 2015 Link to this post

    I have been running fiddler for a while without any problems. Since the weekend it is broken. Fiddler starts fine

    13:44:07:3817 Fiddler Running...
    13:44:07:3817 Setting upstream gateway to none
    13:44:07:3817 [FILTERS] Previously enabled filters have been carried over from the last Fiddler instance. Click the Filters tab to view the selected options.
    13:44:07:4910 Windows 8+ AppContainer isolation feature detected.

    I can use the composer and make http requests and that work fine too. However from my apps or Explorer or chrome the request is blocked. Chrome says ERR_CONNECTION_RESET. My .NET apps say

    Once I shut fiddler down everything is happy again.

    This is on Windows 8. I think this might have started after a windows update reboot. Is there a know issue? I did uninstall and install the fiddler again with no joy.

    Appreciate any guidance.

  2. Craig
    Craig avatar
    2 posts
    Member since:
    May 2015

    Posted 19 May 2015 Link to this post

    I discovered that a service ipoverusbsvc registers on port 8888. Fiddler didn't tell me that until I uninstalled fiddler and rebooted and started fiddler again. This article seems to show that it has been a problem for a while

    Do you know why fiddler could not have detected this previously?

  3. Eric Lawrence
    Eric Lawrence avatar
    832 posts

    Posted 19 May 2015 Link to this post

    Hi, Craig--

    The IPOverUSBSvc only captures traffic under certain conditions (e.g. when you have a Windows Phone actively tethered to the PC). In terms of why it's not "detected"-- the service isn't listening on the port exclusively, and as a consequence Fiddler isn't blocked from calling .Listen() on the port. It simply doesn't get any traffic if IPOverUSBSvc is stealing it all.

    Fiddler has used 8888 and was popular inside Microsoft for many years before the Windows Phone team existed, but unfortunately there's not really much I can do to force them to use a different port.

    Eric Lawrence
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