When trying to start Fiddler on MacOS 10.14 (Mojave), I see the following crash.  Has anyone gotten Fiddler working on Mojave?

 

 

$ mono Fiddler.exe

WARNING: The Carbon driver has not been ported to 64bits, and very few parts ofWindows.Forms will work properly, or at all
Stacktrace:

  at <unknown> <0xffffffff>
  at (wrapper managed-to-native) System.Windows.Forms.XplatUICarbon.CGDisplayBounds (intptr) [0x00002] in <7cb6368c5ba549ff8a02965fd9de701e>:0
  at System.Windows.Forms.XplatUICarbon.get_WorkingArea () [0x00005] in <7cb6368c5ba549ff8a02965fd9de701e>:0
  at System.Windows.Forms.XplatUICarbon.get_VirtualScreen () [0x00000] in <7cb6368c5ba549ff8a02965fd9de701e>:0
  at System.Windows.Forms.XplatUI.get_VirtualScreen () [0x00000] in <7cb6368c5ba549ff8a02965fd9de701e>:0
  at System.Windows.Forms.Screen..cctor () [0x00034] in <7cb6368c5ba549ff8a02965fd9de701e>:0
  at (wrapper runtime-invoke) object.runtime_invoke_void (object,intptr,intptr,intptr) [0x0001e] in <14f1e720d53a4a6a8800252bec102319>:0
  at <unknown> <0xffffffff>
  at System.Windows.Forms.Form.get_CreateParams () [0x00157] in <7cb6368c5ba549ff8a02965fd9de701e>:0
  at System.Windows.Forms.Control.CreateHandle () [0x0002a] in <7cb6368c5ba549ff8a02965fd9de701e>:0
  at System.Windows.Forms.Form.CreateHandle () [0x00000] in <7cb6368c5ba549ff8a02965fd9de701e>:0
  at System.Windows.Forms.Control.CreateControl () [0x00039] in <7cb6368c5ba549ff8a02965fd9de701e>:0
  at System.Windows.Forms.Control.SetVisibleCore (bool) [0x00057] in <7cb6368c5ba549ff8a02965fd9de701e>:0
  at System.Windows.Forms.Form.SetVisibleCore (bool) [0x00065] in <7cb6368c5ba549ff8a02965fd9de701e>:0
  at System.Windows.Forms.Control.set_Visible (bool) [0x00009] in <7cb6368c5ba549ff8a02965fd9de701e>:0
  at System.Windows.Forms.Control.Show () [0x00000] in <7cb6368c5ba549ff8a02965fd9de701e>:0
  at (wrapper remoting-invoke-with-check) System.Windows.Forms.Control.Show () [0x00031] in <7cb6368c5ba549ff8a02965fd9de701e>:0
  at Fiddler.frmViewer.‹• (string[]) [0x00081] in <09623c708fdb40a483cea147bbea7a7f>:0
  at Fiddler.frmViewer.‡• (string[]) [0x00016] in <09623c708fdb40a483cea147bbea7a7f>:0
  at (wrapper runtime-invoke) <Module>.runtime_invoke_void_object (object,intptr,intptr,intptr) [0x0004e] in <09623c708fdb40a483cea147bbea7a7f>:0
exception inside UnhandledException handler: The type initializer for 'System.Windows.Forms.Screen' threw an exception.

[ERROR] FATAL UNHANDLED EXCEPTION: System.TypeInitializationException: The typeinitializer for 'System.Windows.Forms.Screen' threw an exception. ---> System.NullReferenceException: Object reference not set to an instance of an object
  at (wrapper managed-to-native) System.Windows.Forms.XplatUICarbon.CGDisplayBounds(intptr)
  at System.Windows.Forms.XplatUICarbon.get_WorkingArea () [0x00005] in <7cb6368c5ba549ff8a02965fd9de701e>:0
  at System.Windows.Forms.XplatUICarbon.get_VirtualScreen () [0x00000] in <7cb6368c5ba549ff8a02965fd9de701e>:0
  at System.Windows.Forms.XplatUI.get_VirtualScreen () [0x00000] in <7cb6368c5ba549ff8a02965fd9de701e>:0
  at System.Windows.Forms.Screen..cctor () [0x00034] in <7cb6368c5ba549ff8a02965fd9de701e>:0
   --- End of inner exception stack trace ---
  at System.Windows.Forms.MessageBox+MessageBoxForm.InitFormsSize () [0x00002] in <7cb6368c5ba549ff8a02965fd9de701e>:0
  at System.Windows.Forms.MessageBox+MessageBoxForm.RunDialog () [0x0000f] in <7cb6368c5ba549ff8a02965fd9de701e>:0
  at (wrapper remoting-invoke-with-check) System.Windows.Forms.MessageBox+MessageBoxForm.RunDialog()
  at System.Windows.Forms.MessageBox.Show (System.Windows.Forms.IWin32Window owner, System.String text, System.String caption, System.Windows.Forms.MessageBoxButtons buttons, System.Windows.Forms.MessageBoxIcon icon) [0x0000b] in <7cb6368c5ba549ff8a02965fd9de701e>:0
  at Fiddler.FiddlerApplication.DoNotifyUser (System.Windows.Forms.IWin32WindowownerWnd, System.String sMessage, System.String sTitle, System.Windows.Forms.MessageBoxIcon oIcon) [0x0002c] in <09623c708fdb40a483cea147bbea7a7f>:0
  at Fiddler.FiddlerApplication.DoNotifyUser (System.String sMessage, System.String sTitle, System.Windows.Forms.MessageBoxIcon oIcon) [0x00000] in <09623c708fdb40a483cea147bbea7a7f>:0
  at Fiddler.FiddlerApplication.ReportException (System.Exception eX, System.String sTitle, System.String sCallerMessage) [0x001a4] in <09623c708fdb40a483cea147bbea7a7f>:0
  at Fiddler.FiddlerApplication.ReportException (System.Exception ‚) [0x00006] in <09623c708fdb40a483cea147bbea7a7f>:0
  at Fiddler.frmViewer.• (System.Object, System.UnhandledExceptionEventArgs •) [0x00006] in <09623c708fdb40a483cea147bbea7a7f>:0

I am using Fiddler with HTTPS decoding for development purposes (some AutoResponder rules), but recently Fiddler has started to just randomly block all HTTPS traffic at some point. That is, I am running Fiddler and everything works, and then suddenly it stops, and I get timeout on all HTTPS requests.

What I know so far:

1. Only HTTPS traffic stops, other traffic is not affected
2. Cancelling HTTPS decryption or network capture returns everything to normal (expected)
3. Restarting Fiddler helps for about a minute and then traffic stops again
4. Port 443 is not blocked, telnetting hosts on port 443 works just fine

How can I troubleshoot this issue?

Thanks in advance.

Launching and closing Fiddler on Mac prompts for admin authN as it tries to configure the network(WiFi adapter in my case.)

I assume it's doing this to set the proxy. Does anyone know how to give Fiddler rights to make these changes whenever necessary, without the authN prompt?

Thanks

What I am wanting to achieve I think can be done with Fiddler Core, but I am not really a developer, I know enough to modify code and compile it but not to start from scratch.

This is what I want to achieve, I want to listen for a specific URL and POST value, then change the response (which I can do in Fiddler no problem), I want to then compile these settings into a standalone exe with no user interface or options, so i can simply doubel click and have it work on any pc. Since this would seem like a fairly standard use of Fiddlercore, is there a sample project I can download to start me off?

Slightly off topic to the above, rather than wait for the response from the server, can I just respond automatically (maybe add some latency first) and drop the real response if/when it comes?

 

thanks!

 

 

Hi,

 

I'm trying to use Fiddler Everywhere on macOS Mojave (10.14.4) and the proxy does not appear to enable after clicking the Capture button.  When I initially installed Fiddler and opened it, I was prompted for my password (but it still did not appear to be capturing any networking traffic).  I also got the password prompt the first time I closed the app.

 

I have since re-opened the app a few times and tried to click the Capture button, but nothing happens.  I also no longer ever get any password prompts (either on app open/close/capture button click).  I've tried to uninstall + reinstall the app as well with no change in behavior.

 

I also tried to run the app using sudo (using the following command):
sudo /Applications/Progress\ Telerik\ Fiddler.app/Contents/MacOS/Progress\ Telerik\ Fiddler

 

Please find the logs (electon.log and netcore.log) attached.

 

Any idea what might be going wrong?

Thanks

I'd like to be able to decode/inspect websocket messages (messages are 20-byte binary) so that each message can appear in a human readable way.  We basically just want to extend/add a custom websocket inspector which will show the selected message after it's been custom "decoded".  I have purchased Debugging with Fiddler Second Edition, but don't see any guidance for implementing a custom Websockets inspector.

Any guidance would be greatly appreciated!

Thanks!

Jim

When connecting my phone to fiddler, I am able to receive traffic. However, which host do I select to filter so fiddler only shows traffic from my phone? Both AppleDeviceService and YourPhone did not work for me.

Reinstalling without keeping settings did not help. I'm guessing I have something really huge/corrupted in the Composer history. Which file / registry key should I delete?

Thanks!

Hi, i have one problem, i use fiddler every day, and now i have this problem, viz picture, https://ctrlv.cz/qHTh i have this locks, and internet say me your connection is not private, can you help me please? A use for Gaming, I'm desperate

I installed the Fiddler on the Mac.

Following the instructions, when I enter

mono Fiddler.exe

I get the following error message:

-bash: mono: command not found

 

Any ideas?

Thanks,

Michael