"Your connection is not private" whenever I start Fiddler

17 posts, 0 answers
  1. Avrohom Yisroel
    Avrohom Yisroel avatar
    47 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
    832 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
    47 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
    47 posts
    Member since:
    Jan 2011

    Posted 04 Jan 2016 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 2016 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
    549 posts

    Posted 25 Feb 2016 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 2016 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
    549 posts

    Posted 01 Mar 2016 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
  9. Keith
    Keith avatar
    2 posts
    Member since:
    Dec 2014

    Posted 05 May 2017 Link to this post

    Gotcha I ran into:  resetting Windows Root Certs did not work, turns out I still had the old CertMaker DLL installed.  Uninstalled the old CertMaker plugin, noticed Fiddler certs are now generated by CertEnroll, reset Root Certs, and voila.

    Thorny problem that caused a wonky error:  Outlook would disconnect from Exchange whenever Fiddler was not running (even if traffic capture was turned off).
  10. Jitendra
    Jitendra avatar
    1 posts
    Member since:
    Oct 2017

    Posted 25 Oct 2017 Link to this post


    Here is how to fix Your Connection is Not Private Error In Chrome
    One of the main reasons behind such an error may be the wrong date and time settings. The SSL might fail to fetch data from the server when an inaccurate date is provided. To change them, go to Date and Time under Settings in your system, and choose the option Set Time Automatically. This helps in securing loading of data.
    Slide the bar below Set Time Automatically to turn it on.This lets the system to fetch time directly from the network, thus providing accurate measures.
    Source:- http://merabheja.com/connection-not-private-error-in-chrome/
  11. soanl
    soanl avatar
    1 posts
    Member since:
    Apr 2018

    Posted 24 Apr 2018 Link to this post

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  12. Neyla
    Neyla avatar
    3 posts
    Member since:
    Jun 2018

    Posted 08 Jun 2018 Link to this post

    I have Fiddler installed on my machine. I have installed the Fiddler Root Certificate to decrypt HTTPS traffic, but it only works in FF and IE, not in chrome. Chrome does not trust Fiddler's certificate and does not allow me to connect to any tunneled connections.
    I tried looking on Fiddler2.com's page for a plugin but I don't see anyhing.

  13. Neyla
    Neyla avatar
    3 posts
    Member since:
    Jun 2018

    Posted 10 Jun 2018 in reply to Neyla Link to this post

    I have Fiddler installed on my machine. I have installed the Fiddler Root Certificate to decrypt HTTPS traffic, but it only works in FF and IE, not in chrome. Chrome does not trust Fiddler's certificate and does not allow me to connect to any tunneled connections.
    I tried looking on Fiddler2.com's page for a plugin but I don't see anyhing https://bluestacks.vip/  https://textnow.vip/    https://photomath.vip/
  14. Alexander
    Admin
    Alexander avatar
    383 posts

    Posted 12 Jun 2018 Link to this post

    Hi,

    Which version of Chrome are you using? Also, would it be possible to navigate to a page, where Chrome says "Your connection is not private", hit F12 and go to the Security tab? There shoould be some information why the certificate is not trusted.

    Regards,
    Alexander
    Progress 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
  15. Lairger
    Lairger avatar
    4 posts
    Member since:
    Jun 2018

    Posted 28 Jun 2018 Link to this post

    Fiddler normally is a valid network analysis tool, but I hope some malware/virus did not auto-install it with an invalid root cert for bad purposes.  Have you run an antivirus scan on your computer?

    To remove any untrusted certificates from your Windows computer, try the following:

    1. Click Start, type certmgr.msc in the search box and press Enter.
    2. In the left panel, navigate to Untrusted Certificates and then expand Certificates.
    3. Right click on the certificates you wish to remove and choose Delete.
  16. Hare
    Hare avatar
    3 posts
    Member since:
    Jul 2018

    Posted 13 Jul 2018 Link to this post

    This feature works by periodically checking whether Fiddler is running, and automatically adjusting the proxy settings based on that check. If you click on the status bar panel, a popup menu enables you to change your FiddlerHook settings.
  17. Bashar
    Bashar avatar
    1 posts
    Member since:
    May 2015

    Posted 09 Sep 2018 in reply to Alexander Link to this post

    I did all steps But!

    This page is not secure (broken HTTPS).
    Certificate - insecure (SHA-1)
    The certificate chain for this site contains a certificate signed using SHA-1.
    View certificate

    Certificate - Subject Alternative Name missing
    The certificate for this site does not contain a Subject Alternative Name extension containing a domain name or IP address.
    View certificate

    Certificate - missing
    This site is missing a valid, trusted certificate (net::ERR_CERT_COMMON_NAME_INVALID).
    View certificate
    ===================================

    Chrome : 68.0.3440.106 (Official Build) (32-bit)

    Fiddler Https Interface : https://i.imgur.com/c5GKSNl.png

     

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