Fiddler doesn't appear

9 posts, 0 answers
  1. Matthew
    Matthew avatar
    3 posts
    Member since:
    Apr 2011

    Posted 15 Aug 2017 Link to this post

    Just updated to the latest version of Fiddler () and it ran the first time, but as soon as I installed the root certificate to decrypt HTTPS it won't run anymore. Nothing appears in the UI, but I get 2 event log errors. I'm on the latest Insiders fast build, VS 2017.3 is installed. If you need anything else let me know.

    1)

    Application: Fiddler.exe
    Framework Version: v4.0.30319
    Description: The process was terminated due to an unhandled exception.
    Exception Info: System.IO.FileNotFoundException
       at Fiddler.FiddlerApplication..cctor()

    Exception Info: System.TypeInitializationException
       at Fiddler.FiddlerApplication.ReportException(System.Exception, System.String)
       at Fiddler.CONFIG..cctor()

    Exception Info: System.TypeInitializationException
       at Fiddler.frmViewer.•(System.Object, System.UnhandledExceptionEventArgs)

     

    2)

    Faulting application name: Fiddler.exe, version: 4.6.3.44034, time stamp: 0x580e4d17
    Faulting module name: KERNELBASE.dll, version: 10.0.16257.1, time stamp: 0x7fd7fb50
    Exception code: 0xe0434352
    Fault offset: 0x0000000000051b88
    Faulting process ID: 0x2610
    Faulting application start time: 0x01d315ed66e8c274
    Faulting application path: C:\Program Files (x86)\Fiddler2\Fiddler.exe
    Faulting module path: C:\WINDOWS\System32\KERNELBASE.dll
    Report ID: 883f6394-5736-4f47-8c39-d761608eb7c1
    Faulting package full name: 
    Faulting package-relative application ID: 

  2. Zev
    Zev avatar
    2 posts
    Member since:
    Aug 2017

    Posted 21 Aug 2017 in reply to Matthew Link to this post

    I'm seeing the same issue when I updated Fiddler (to 4.6.3.44034), but Fiddler doesn't even run the first time.

    I tried reinstalling .NET Framework 2 (per this FAQ answer), and uninstalling and reinstalling Fiddler, with no success.

    I also tried deleting the root certificate issued to DO_NOT_TRUST_Fiddler, as well as all certificates issued by that root certificate.

    I am running Windows 10 Pro 64-bit 1703 (build 15063.540).

    I have Visual Studio Community 2017 (15.3.1) installed, with .NET Framework 4.7.02046.

  3. Alexander
    Admin
    Alexander avatar
    383 posts

    Posted 21 Aug 2017 Link to this post

    Hi Matthew,

    How did you ran it the first time? Using a shortcut or the update process started it automatically? Also do you remember which version was installed before the update?

    Regards,
    Alexander
    Progress Telerik
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  4. Alexander
    Admin
    Alexander avatar
    383 posts

    Posted 21 Aug 2017 Link to this post

    Hello Zev,

    I assume you meant from​ 4.6.3.44034, since it is not the latest version. The last version is 4.6.20172.34691. Did you upgrade to this one?

    Regards,
    Alexander
    Progress Telerik
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  5. Zev
    Zev avatar
    2 posts
    Member since:
    Aug 2017

    Posted 21 Aug 2017 in reply to Alexander Link to this post

    Alexander said:
    I assume you meant from 4.6.3.44034, since it is not the latest version. The last version is 4.6.20172.34691. Did you upgrade to this one?

    The version number of FiddlerSetup.exe (Properties -> Details -> File version) is also 4.6.20172.34691. I downloaded this today, and used it to reinstall Fiddler.

    However, the version number of C:\Program Files (x86)\Fiddler2\Fiddler.exe is 4.6.3.44034; this is the target of the Start Menu .lnk file.

    Presumably I updated to the latest version, and that specific file has an older file version; which means it's irrelevant to the issue.

    Thanks in advance.

  6. Matthew
    Matthew avatar
    3 posts
    Member since:
    Apr 2011

    Posted 22 Aug 2017 in reply to Alexander Link to this post

    Hi Alexander,

    I ran Fiddler and it worked, it prompted to auto-update and then wouldn't restart. I tried uninstalling, reinstalling, removing root cert, adding it back manually (including all of the certificates that had been auto-generated).

    I'm afraid I don't know which version I was on previously

  7. Alexander
    Admin
    Alexander avatar
    383 posts

    Posted 28 Aug 2017 Link to this post

    Hi,

    Questions to both of you - what are the contents of this folder - C:\Program Files (x86)\Fiddler2? Also what is your account status - are you administrators at all times or you are using a User account and elevate with administrative right only when needed? And finally - what is the version of Fiddler shown in "Programs and Features"?

    As a temporary workaround you can find working copy of Fiddler at %LOCALAPPDATA%\Programs\Fiddler.

    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
  8. Matthew
    Matthew avatar
    3 posts
    Member since:
    Apr 2011

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

        Directory: C:\Program Files (x86)\Fiddler2


    Mode                LastWriteTime         Length Name
    ----                -------------         ------ ----
    d-----       25/08/2015     17:47                Inspectors
    d-----       15/08/2017     18:00                Scripts
    -a----       24/10/2016     16:04        1252192 Fiddler.exe
    -a----       24/10/2016     16:04        1107456 Fiddler.pdb
    -a----       31/01/2014     17:43           3158 IE_Toolbar.ico
    -a----       24/10/2016     16:04          52064 UpdateFiddler.exe

     

    I run as a user and elevate when required. Fiddler shows up as "Progress Telerik Fiddler" and has version 4.6.20172.31233

    The version in LocalAppData does indeed work

  9. Alexander
    Admin
    Alexander avatar
    383 posts

    Posted 12 Sep 2017 Link to this post

    Hello,

    Thank you for the follow-up. It is very appreciated.

    I think I've found the problem. It is a bug in the uninstaller of v4.6.3.44034 (the one installed before the update). In order to fix it you can go to the following folder and delete the "Fiddler 4" shortcut - C:\ProgramData\Microsoft\Windows\Start Menu\Programs. After that you should be able to start Fiddler as usual. Please, let me know if that worked for you.

    Regards,
    Alexander
    Progress Telerik
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