"Your connection is not private" whenever I start Fiddler

8 posts, 0 answers
  1. Avrohom Yisroel
    Avrohom Yisroel avatar
    35 posts
    Member since:
    Jan 2011

    Posted 31 Dec 2015 Link to this post

    Hello,

    As soon as I start Fiddler, any attempt to connect to a secure web page fails with the message "Your connection is not private" in my web browser.

    What's going on?

     Thanks

  2. Eric Lawrence
    Admin
    Eric Lawrence avatar
    833 posts

    Posted 31 Dec 2015 Link to this post

    Hi, 

    This generally indicates that you have enabled HTTPS decryption but haven't configured Windows (or Firefox, if you're using Firefox) to trust Fiddler's root certificate.

    The simplest thing to do would be to follow these steps, and when asked if you'd like Windows to trust Fiddler's root certificate, choose "Yes."

    http://textslashplain.com/2015/10/30/reset-fiddlers-https-certificates/


    Regards,
    Eric Lawrence
    Telerik
    Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Feedback Portal and vote to affect the priority of the items
  3. Avrohom Yisroel
    Avrohom Yisroel avatar
    35 posts
    Member since:
    Jan 2011

    Posted 31 Dec 2015 in reply to Eric Lawrence Link to this post

    I'm actually using Chrome, but I checked it in IE as well, and got the same issue. Anyway, I'll give that a go and see what happens.

    Thanks

  4. Avrohom Yisroel
    Avrohom Yisroel avatar
    35 posts
    Member since:
    Jan 2011

    Posted 04 Jan Link to this post

    Turns out the answer was simple. I was using version 2.6.2, whereas I should have been using 4.6.2. I uninstalled, installed the latest and it works fine.

    Thanks

  5. Gene
    Gene avatar
    3 posts
    Member since:
    Feb 2016

    Posted 22 Feb Link to this post

    Just installed 4.6.2.0.  Selected to decrypt HTTPS, exported the Fiddler self-signed root, imported it under Windows 7 Trusted Root CA using certmgr.msc, and verified Windows trusts it.  Then imported it into Firefox 44.0.2 Advanced > Certificates > View Certificates > Authorities with Trust Setting to Identify Websites.  Every https reference when Fiddler is running, regardless of browser, gives "Your connection is not secure" error.  If I close Fiddler, no errors.  Rebooted, no change.  Not sure what I'm doing wrong.

    TIA, Gene

  6. Tsviatko Yovtchev
    Admin
    Tsviatko Yovtchev avatar
    408 posts

    Posted 25 Feb Link to this post

    Hello,

    Could you, please, try following these steps:

    1. Click Tools > Fiddler Options.
    2. Click the HTTPS tab.
    3. Ensure that the text says Certificates generated by CertEnroll engine.
    4. Click Actions > Reset Certificates. This may take a minute.
    5. Accept all prompts


    Regards,

    Tsviatko Yovtchev
    Telerik
    Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Feedback Portal and vote to affect the priority of the items
  7. Gene
    Gene avatar
    3 posts
    Member since:
    Feb 2016

    Posted 25 Feb in reply to Tsviatko Yovtchev Link to this post

    Thank you Tsviatko.  After executing the steps you provided (and importing the new cert into Firefox), all https requests work properly from all browsers, and Fiddler is properly capturing.

    Can you tell me what the problem was, and what may have caused it?

  8. Tsviatko Yovtchev
    Admin
    Tsviatko Yovtchev avatar
    408 posts

    Posted 01 Mar Link to this post

    Hi,

    Well Fiddler has upgraded certificates infrastructure. This - http://textslashplain.com/2015/10/30/reset-fiddlers-https-certificates/ (also mentioned previously) explains it.

    Regards,
    Tsviatko Yovtchev
    Telerik
    Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Feedback Portal and vote to affect the priority of the items
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