On first launch, it show an error dialog ( see attached screenshot), after click the button, it crashes.

 

➜  fiddler-linux uname -a                
Linux nil 4.8.0-39-generic #42~16.04.1-Ubuntu SMP Mon Feb 20 15:06:07 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
➜  fiddler-linux mono --version  
Mono JIT compiler version 4.8.0 (Stable 4.8.0.495/e4a3cf3 Wed Feb 22 18:30:58 UTC 2017)
Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com
        TLS:           __thread
        SIGSEGV:       altstack
        Notifications: epoll
        Architecture:  amd64
        Disabled:      none
        Misc:          softdebug 
        LLVM:          supported, not enabled.
        GC:            sgen
➜  fiddler-linux mono Fiddler.exe
[ERROR] FATAL UNHANDLED EXCEPTION: System.ArgumentOutOfRangeException: Value '-2147483648' must be greater than or equal to 0.
Parameter name: SmallChange
  at System.Windows.Forms.ScrollBar.set_SmallChange (System.Int32 value) [0x0001c] in <e37081a3704b4473a59cdf5048ad96bc>:0 
  at (wrapper remoting-invoke-with-check) System.Windows.Forms.ScrollBar:set_SmallChange (int)
  at System.Windows.Forms.ListView.CalculateScrollBars () [0x00247] in <e37081a3704b4473a59cdf5048ad96bc>:0 
  at System.Windows.Forms.ListView.CalculateListView (System.Windows.Forms.ListViewAlignment align) [0x000f5] in <e37081a3704b4473a59cdf5048ad96bc>:0 
  at System.Windows.Forms.ListView.Redraw (System.Boolean recalculate) [0x00029] in <e37081a3704b4473a59cdf5048ad96bc>:0 
  at System.Windows.Forms.ListView.set_View (System.Windows.Forms.View value) [0x00097] in <e37081a3704b4473a59cdf5048ad96bc>:0 
  at (wrapper remoting-invoke-with-check) System.Windows.Forms.ListView:set_View (System.Windows.Forms.View)
  at Fiddler.frmViewer.InitializeComponent () [0x03e23] in <bcca41f124814dd9a74204fd482fb6d7>:0 
  at Fiddler.frmViewer.NotifyInvalidate (System.Drawing.Rectangle invalidatedArea) [0x00011] in <bcca41f124814dd9a74204fd482fb6d7>:0 
  at (wrapper remoting-invoke-with-check) Fiddler.frmViewer:.ctor ()
  at Fiddler.frmViewer.RunMain (System.String[] arrArgs) [0x00153] in <bcca41f124814dd9a74204fd482fb6d7>:0 
  at Fiddler.frmViewer.Main (System.String[] arrArgs) [0x00016] in <bcca41f124814dd9a74204fd482fb6d7>:0 
➜  fiddler-linux 

Hello, I'd like to know if there's a way to show an error generated by the browser or at least be able to edit the errors provided by FiddlerCore to something a bit clearer for a not so technical end user.

I'm talking about errors generated in cases such as when there are issues resolving a DNS query: "[Fiddler] DNS Lookup for "DOMAIN.COM" failed. System.Net.Sockets.SocketException No such host is known"

Thank you.

Hello,

is some special difference between session.WriteRequestToStream, WriteResponseToStream, WriteMetadataToStream and Session.WriteToStream Method?

In class SAZFormat (file SAZ-DOTNETZIP.cs) are using first three methods instead WriteToStream. That's why I'm asking.

Thanks

Hi there! 

I'm using Mac OS 10.10.5. I installed mono and Fiddler for Mac. I can run Fiddler, but when I do I see the following in the console:

 

Whenever I try to start capturing traffic the same message pops up in the console and the capture never starts. It looks like it's parsing the contents of the active.txt file which has the following:

Does anyone have any advice on how I can get past this?

 

Thanks!

Justin

---------------------------

Failed to save MeddlerScript
---------------------------
Fiddler has encountered an unexpected problem. If you believe this is a bug in Fiddler, please copy this message by hitting CTRL+C, and submit a bug report at http://www.telerik.com/forums/fiddler.

Value cannot be null.

Parameter name: inArray

Type: System.ArgumentNullException
Source: mscorlib
   at System.Convert.ToBase64String(Byte[] inArray)

   at BasicFormats.MeddlerExport.ExportSessions(String sFormat, Session[] oSessions, Dictionary`2 dictOptions, EventHandler`1 evtProgressNotifications) in C:\JenkinsHome\jobs\FiddlerReleaseBuild\workspace\Fiddler2\BundledExtensions\BasicFormats\MeddlerExport.cs:line 54


Fiddler v4.6.20171.7553 (x64 AMD64) [.NET 4.0.30319.42000 on Microsoft Windows NT 6.3.9600.0] 
---------------------------
OK   
---------------------------

I am running Fiddler as windows service and when I reset Internet options, Fiddler no longer acts as system proxy. Is there a way for Fiddler to detect changes in  proxy server and re-attach itself as system proxy?

This is what I tried

static function OnDetach() {

if (FiddlerApplication.oProxy.DetachedUnexpectedly)  { 
   FiddlerApplication.oProxy.Attach;

   }

}

Thanks in advance.

Hello,

I have been using fiddler to debug some web apps for mobile for over a year with no problem with my Motorola sb5101 modem.
I switched to a thompson twg850, and suddently, it no longer works on mobile. Whenever I point the mobile to the correct address
it shows blank. It's able to capture the computers traffic without a problem though.

Any thoughts? Any possible settings I might want to enable/disable on the other modem?
Thank yo

Hi,

some users have problems when Fiddler tries to load my custom inspector. The attached error is thrown at Fiddler startup.

I installed the exactly same version of Fiddler and it worked for me. So it seems to be an environment problem. I tried it also with x64, x86 and AnyCPU.

After setting the fiddler.debug.extensions.showerrors and  fiddler.debug.extensions.verbose config parameters the Log does not contains more information about the error. It only says

15:16:45:7122 Looking for Inspectors inside C:\Users\xxx\Documents\Fiddler2\Inspectors\MyInspector.dll

There are no further error details in the log file.

It would be great to get some help from you. I don't understand why the inspector works on most of the PCs but not on all.

Best regards, Christian

Well... i had a bunch of suggestions and a really thoughtful post of 7 issues, but then i closed fiddler, forgot to reset the proxy, pressed "Post this thread" and lost everything... so... here we go again...

1. First of all, congrats on the step guys! really good move! Kudos
2. Reissuing sequentially is not working at all... Not by pressing "S" or by "right-click->Replay->Reissue Sequentially". I use this A LOT so this is kind of a show-stopper for me...
3. Proxy set/reset needs to be automatic... setting/reseting manually is something i can live with for now, but causes major headaches sometimes...
4. Autoscroll is happening even if my scroll bar is NOT at the bottom... i can live with it...
5. "Stop/Start capturing" is not working... to start/stop capture you need to set/reset the proxy... bad but i can live with it
6. "Timeline" tab is 100% blank... i use it a lot but i can live without it for now...

I installed Fiddler on Ubuntu 16.04, and imported its root certificate into Chromium. Thanks for that. I do not see the "Web View" button anywhere. Is this not available for the Linux version, or do I need to add the column somehow?