Fiddler doesnt capture anything

3 posts, 0 answers
  1. Ghioca
    Ghioca avatar
    2 posts
    Member since:
    Aug 2018

    Posted 26 Aug 2018 Link to this post

    So I just installed fiddler on my PC and I'm not able to capture any traffic. I had it installed some time ago and it was working just fine. What I've tried:

    -If I click help-> troubleshoot, these 4 requests will be added to fiddler : . But It still doesnt capture anything if I acces a website

    -If I navigate to  http://ipv4.fiddler:8888/, fiddler doesnt show any new capture (also the website returns the error "this site cant be reached")

    -If I navigate to http://localhost:8888/, fiddler is able to capture the request

    -My proxy settings are ok (they are set to

    -I'm using chrome to do all these tests. I've tried other browsers and they dont work either

    -I have Decrypt HTTPS traffic enabled. I also tried pressing actions -> trust root certificate

  2. Ghioca
    Ghioca avatar
    2 posts
    Member since:
    Aug 2018

    Posted 26 Aug 2018 in reply to Ghioca Link to this post

    UPDATE : requests made by apps appear. Also, requests made using internet explorer also appear. The problem is only for chrome and firefox. What could be the problem? I dont have any extension that could change the proxy or something.
  3. Simeon
    Simeon avatar
    242 posts

    Posted 30 Aug 2018 Link to this post

    Hello Ghioca,

    As far as I know, by default Firefox is not configured to use the system proxy settings. You need to open the Options tab, scroll down to the Network Proxy section and click the Settings... button. There you could either select the 'Use system proxy settings', or 'Manual proxy configuration' and type, Port 8888 for the HTTP and SSL Proxy fields.

    However, Chrome is using the system proxy settings by default and Fiddler should capture its traffic. Please, make sure that you don't have any Chrome extensions which could change its proxy settings. Please, also check that Fiddler does not have any filters enabled and if the Auto Responder is enabled make sure that the Unmatched requests passthrough.

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