Unable to get fiddler working on phone

2 posts, 1 answers
  1. Mukund
    Mukund avatar
    1 posts
    Member since:
    May 2014

    Posted 05 May 2014 Link to this post

    I have installed fiddler on my work desktop PC that is connected to a domain.

    From my desktop
     I am able to see the fiddler echo service page
     I can all the traffic on fiddler

    From my work laptop which is also connected to the domain to use the fiddler on desktop as a proxy
     I am able to see the fiddler echo service page
     I can see all the traffic from my laptop on the fiddler running on my desktop
    But when I try to connect my phone (which is in the same wifi as the laptop but is not connected to the domain) to use the proxy on my desktop
     I DONT see the fiddler echo service page
     I DONT see any traffic on fiddler
     The phone is not able to access internet
     I used the "Ping" app on iOS and it is able to ping my desktop
     I have tried to use both iOS and windows phone and I get the same results.

    I have tried:
    1. Allowing remote connections
    2. prefs set fiddler.network.proxy.registrationhostname <desktop PC ipaddress>
    3. Restarted fiddler

    Am I doing anything wrong? What else do I need to do?
    Any help is appreciated.
  2. Answer
    Eric Lawrence
    Eric Lawrence avatar
    833 posts

    Posted 08 May 2014 Link to this post

    Hi, Mukund--

    copying from https://groups.google.com/forum/#!topic/httpfiddler/nmgr5kZ6RkU
    You don't need to set registrationhostname when using a remote device (and you should undo that using about:config or Fiddler will break the next time your PC gets a new IP).
    You have correctly set "Allow Remote Connections" and your firewall is properly configured; we know this because you're able to see traffic from your laptop.
    Would I be correct in guessing that you're a Microsoft employee who is connected to CorpNet?
    The problem you're having is almost certainly caused by use of IPsec, which prevents TCP/IP connections from non-domain devices to domain-joined PCs. You need to go to ITWeb and search for "IPsec boundary exemption" which will lead to a form which you can use to set your desktop PC as exempt from IPsec rules. Or you can use one of the various "Fiddler as a service" servers that some teams around the company have configured (which are already boundary-exempt). 

    Eric Lawrence

    Check out the Telerik Platform - the only platform that combines a rich set of UI tools with powerful cloud services to develop web, hybrid and native mobile apps.

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