Failed to register Fiddler as the system proxy

16 posts, 1 answers
  1. gskw
    gskw avatar
    2 posts
    Member since:
    Feb 2017

    Posted 11 Feb 2017 Link to this post

    Fiddler is failing set up the system proxy.

     

    This is what the log says:

    11:37:30:6321 Fiddler Running...
    11:37:30:6321 Fiddler was unable to get information about the proxy for 'DefaultLAN' [0x2f92].

    11:37:30:6321 !WARNING: Failed to get proxy information for Connection 'DefaultLAN'.
    11:37:30:6321 Setting upstream gateway to none
    11:37:30:6351 Windows 8+ AppContainer isolation feature detected.

     

    I also tried to manually change the proxy settings from inetcpl.cpl. but when I try to click "OK" in the "LAN Settings" dialog, nothing happens. The "Cancel" button does work though.

  2. Answer
    Tsviatko Yovtchev
    Admin
    Tsviatko Yovtchev avatar
    549 posts

    Posted 15 Feb 2017 Link to this post

    Hello,

    The problem doesn't seem to be Fiddler related. For some reason you cannot change the proxy settings on your machine. That has to be fixed for Fiddler to work. Is it possible that this is domain policy?

    Regards,
    Tsviatko Yovtchev
    Telerik by Progress
    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. gskw
    gskw avatar
    2 posts
    Member since:
    Feb 2017

    Posted 16 Feb 2017 in reply to Tsviatko Yovtchev Link to this post

    Indeed, I had to upgrade my version of the Windows 10 Insider Preview and it started working.
  4. Matt
    Matt avatar
    6 posts
    Member since:
    Dec 2013

    Posted 23 Aug 2017 Link to this post

    Also receiving the error with windows 10 creators update. It looks like fiddler is not compatible with Windows 10 creators update build 1703?

    -= Fiddler Event Log =-

    See http://fiddler2.com/r/?FiddlerLog for details.

    09:05:25:4378 Fiddler Running...
    09:05:25:4388 Fiddler was unable to get information about the proxy for 'DefaultLAN' [0x2f92].

    09:05:25:4388 !WARNING: Failed to get proxy information for Connection 'DefaultLAN'.
    09:05:25:4388 !WARNING: The DefaultLAN Gateway information could not be obtained.
    09:05:25:4718 Windows 8+ AppContainer isolation feature detected.

  5. Chris
    Chris avatar
    2 posts
    Member since:
    Aug 2017

    Posted 24 Aug 2017 in reply to Matt Link to this post

    I am experiencing the same issue with Win10 creators update. Manually changing the proxy does not seem to work or save in either the new settings window or the old IE settings window.
  6. Matt
    Matt avatar
    6 posts
    Member since:
    Dec 2013

    Posted 24 Aug 2017 in reply to Chris Link to this post

    Chris said:I am experiencing the same issue with Win10 creators update. Manually changing the proxy does not seem to work or save in either the new settings window or the old IE settings window.

    That is exactly what I am experiencing as well. I'm guessing Microsoft may have broken something with IE 11 in the latest Windows 10 Creators Update. Hopefully Telerik is on the "red phone" with Microsoft to let them know about this issue as I am sure they have better sway then I would. I also hope the telerik folks are able to replicate this issue. 

  7. Alexander
    Admin
    Alexander avatar
    383 posts

    Posted 28 Aug 2017 Link to this post

    Hello,

    We've created a virtual machine with fresh Win 10 Creators update installation and there was no problem whatsoever. This makes me think that the update procedure have broken something. There are other people over the Internet that experience the same problem like yours. Also there are some tips and tricks to try to fix this behavior, but be careful since most (if not all) of them are not official troubleshooting guides from Microsoft and you are using them at your own risk.

    Regards,
    Alexander
    Progress Telerik
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  8. Matt
    Matt avatar
    6 posts
    Member since:
    Dec 2013

    Posted 30 Aug 2017 in reply to Alexander Link to this post

    I did a fresh install of Windows 10 Creators edition build 1703 (using the MSDN July 2017 ISO). Then applied all windows updates, and the issue presented itself.

    What info on the internet did you find that might fix this issue? I so far have found nothing that hints at a solution to this problem.

  9. Matt
    Matt avatar
    6 posts
    Member since:
    Dec 2013

    Posted 30 Aug 2017 Link to this post

    Also, is there a debug flag to turn on fiddler that might yield more information as to why fiddler gets this error:

    Fiddler was unable to get information about the proxy for 'DefaultLAN' [0x2f92].

  10. Matt
    Matt avatar
    6 posts
    Member since:
    Dec 2013

    Posted 30 Aug 2017 Link to this post

    Is there a debug flag to turn on fiddler to yield more information as to why fiddler gets this error message:

    Fiddler was unable to get information about the proxy for 'DefaultLAN' [0x2f92].

  11. Alexander
    Admin
    Alexander avatar
    383 posts

    Posted 07 Sep 2017 Link to this post

    Hello,

    Rather unfortunately, in this case turning debugging logging on will not yield more information.

    Regards,
    Alexander
    Progress Telerik
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  12. Matt
    Matt avatar
    6 posts
    Member since:
    Dec 2013

    Posted 07 Sep 2017 in reply to Alexander Link to this post

    I did a fresh install of Windows 10 Creators edition build 1703 (using the MSDN July 2017 ISO). Then applied all windows updates, and the issue presented itself.

    What info on the internet did you find that might fix this issue? I so far have found nothing that hints at a solution to this problem.

  13. Chris
    Chris avatar
    2 posts
    Member since:
    Aug 2017

    Posted 08 Sep 2017 Link to this post

    A tech at my work found the solution: You need to start the "WinHTTP Web Proxy Auto-Discovery Service" service for the proxy changes to work. Looks like it's disabled by default in Win10.
  14. Matt
    Matt avatar
    6 posts
    Member since:
    Dec 2013

    Posted 29 Sep 2017 in reply to Chris Link to this post

    Chris that was it!!!

    Hopefully Telerik will update fiddler to detect if that service is stopped and notify the user to enable it.

  15. ju
    ju avatar
    1 posts
    Member since:
    Sep 2018

    Posted 25 Sep 2018 in reply to Chris Link to this post

    but why I cannot open this service, the related services can't be edited either, what should I do?
  16. patiponp203
    patiponp203 avatar
    1 posts
    Member since:
    Sep 2018

    Posted 29 Sep 2018 Link to this post

    Thanks for the good ideas to bring it. I know a lot more.         

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