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:
8 Answers, 1 is accepted
Rank 1
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.
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
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
Rank 1
[quote]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?
[/quote]
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.
Rank 1
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
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
Rank 1
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
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