Hello,

 I am getting the following error in fiddler and without Capture HTTPS CONNECTs it works, also in the Protocols I have enabled: <client>;ssl2;ssl3;tls1.0;tls1.1;tls1.2

fiddler.network.https> HTTPS handshake to <domain> (for #6) failed. System.Security.Authentication.AuthenticationException A call to SSPI failed, see inner exception. < The message received was unexpected or badly formatted

Win32 (SChannel) Native Error Code: 0x80090326

I have a fiddler capture and a netMon capture but don't wish to post that here.

Thank you,

Ahsen Baig

Hi, I'm running fiddler v5.0.20182.28034 for .NET 4.6.1 on Windows 10. When I start a capture or open an archive, after a couple minutes the session window automatically clears. I then have to either recapture my sessions or re-open the archive. 

Is there a setting that is performing the automatic clearing? Seems to happen every couple minutes. 

also note I don't see this behavior on Windows Server with the same version of fiddler. 

thanks!

I knoiw a chrome plugin uses proxy for its communication

Can fiddler intercept that?

Hello, I followed the instructions, but got the below exception - 

$ mono fiddler.exe
WARNING: The Carbon driver has not been ported to 64bits, and very few parts of Windows.Forms will work properly, or at all
Stacktrace:
  at <unknown> <0xffffffff>
  at (wrapper managed-to-native) System.Windows.Forms.XplatUICarbon.CGDisplayBounds (intptr) [0x00002] in <556a6ba2c0a546f1ad2318c309ce0945>:0
  at System.Windows.Forms.XplatUICarbon.get_WorkingArea () [0x00005] in <556a6ba2c0a546f1ad2318c309ce0945>:0
  at System.Windows.Forms.XplatUICarbon.get_VirtualScreen () [0x00000] in <556a6ba2c0a546f1ad2318c309ce0945>:0
  at System.Windows.Forms.XplatUI.get_VirtualScreen () [0x00000] in <556a6ba2c0a546f1ad2318c309ce0945>:0
  at System.Windows.Forms.Screen..cctor () [0x00034] in <556a6ba2c0a546f1ad2318c309ce0945>:0
  at (wrapper runtime-invoke) object.runtime_invoke_void (object,intptr,intptr,intptr) [0x0001e] in <98fac219bd4e453693d76fda7bd96ab0>:0
  at <unknown> <0xffffffff>
  at System.Windows.Forms.Form.get_CreateParams () [0x00157] in <556a6ba2c0a546f1ad2318c309ce0945>:0
  at System.Windows.Forms.Control.CreateHandle () [0x0002a] in <556a6ba2c0a546f1ad2318c309ce0945>:0
  at System.Windows.Forms.Form.CreateHandle () [0x00000] in <556a6ba2c0a546f1ad2318c309ce0945>:0
  at System.Windows.Forms.Control.CreateControl () [0x00039] in <556a6ba2c0a546f1ad2318c309ce0945>:0
  at System.Windows.Forms.Control.SetVisibleCore (bool) [0x00057] in <556a6ba2c0a546f1ad2318c309ce0945>:0
  at System.Windows.Forms.Form.SetVisibleCore (bool) [0x00065] in <556a6ba2c0a546f1ad2318c309ce0945>:0
  at System.Windows.Forms.Control.set_Visible (bool) [0x00009] in <556a6ba2c0a546f1ad2318c309ce0945>:0
  at System.Windows.Forms.Control.Show () [0x00000] in <556a6ba2c0a546f1ad2318c309ce0945>:0
  at (wrapper remoting-invoke-with-check) System.Windows.Forms.Control.Show () [0x00031] in <556a6ba2c0a546f1ad2318c309ce0945>: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 type initializer 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 <556a6ba2c0a546f1ad2318c309ce0945>:0 
  at System.Windows.Forms.XplatUICarbon.get_VirtualScreen () [0x00000] in <556a6ba2c0a546f1ad2318c309ce0945>:0 
  at System.Windows.Forms.XplatUI.get_VirtualScreen () [0x00000] in <556a6ba2c0a546f1ad2318c309ce0945>:0 
  at System.Windows.Forms.Screen..cctor () [0x00034] in <556a6ba2c0a546f1ad2318c309ce0945>:0 
   --- End of inner exception stack trace ---
  at System.Windows.Forms.MessageBox+MessageBoxForm.InitFormsSize () [0x00002] in <556a6ba2c0a546f1ad2318c309ce0945>:0 
  at System.Windows.Forms.MessageBox+MessageBoxForm.RunDialog () [0x0000f] in <556a6ba2c0a546f1ad2318c309ce0945>: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 <556a6ba2c0a546f1ad2318c309ce0945>:0 
  at Fiddler.FiddlerApplication.DoNotifyUser (System.Windows.Forms.IWin32Window ownerWnd, 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 

Hey everyone, I am new to this forum. I've been capturing HTTPS traffic of my web browser without a problem. Now I want to test my command line application which makes requests to an HTTPS server. I've installed FiddlerRoot.cer on my Windows machine, browsers work fine but my app doesn't. It gives handsahke error. I guess I need to provide some certificate to my HttpClient in the code. I don't have deep experiences with certificates and certificate types. Dart language guidelines explains some points but I can't understand. As far as I see, Dart accepts PKCS#12.

Dart tutorial for using certificates: https://dart-lang.github.io/server/tls-ssl.html

My code question on the StackOverflow: https://stackoverflow.com/questions/54278013/certificate-error-when-analyzing-https-traffic-with-fiddler

Just wanted to point out you need to run the 32-bit version of mono to get this to launch without errors.  The maintainers should probably point out that on the Mac download page.

To run it, you need to do a:

'mono --arch=32 Fiddler.exe'

Dear all expert users,

I work with a web app having a specific issue working with Edge browsers. To inspect what happens, I wanted to monitor and debug with Fiddler, but I just can't make my Edge browser communicate with Fiddler2. My environment looks like this:

* Microsoft Edge 38.14393.0.0; proxy settings: Automatic
* Windows 10
* Fiddler v4.6.3.44034
* disabled Windows Firewall.

(1) Browsing in Edge with Fiddler off:
I can surf about as desired.

When I now inspect Edge proxy settings, they are set not to use a proxy. This is as expected.

(2) Starting Fiddler and trying again:

Any attempts to load a web page makes Edge complain, it can not connect to the proxy server (Fiddler). 

This time, Edge proxy settings were changed after Edge restart. Now it's set to use 127.0.0.1:8888 for HTTP and HTTPS, as expected. 

If I try opening another browser session from Fiddler, IE works well and Chrome works well. Only Edge does not connect to the proxy..

I read other threads on this forum, and found suggestions this might happen because of windows firewall, possibly even some hard coded matter in the firewall. However, as I stated above: My problem persist even with firewall turned on or off. Therefore my conclusion: Edge and Fiddler don't cooperate, and it has not to do with the firewall settings.

Uless of course, anyone is able to explain to me what happens or how to make things work. (It would typically be some simple setting I have got wrong, for sure.. You'd make me really happy, if you made me understand. :-)

Cheers,

Aril

I have 2 pc in my home and 1 mac

All 3 are connected to the same router.

The mac has wifi hotspot, so I connect iphone with mac wifi.

When I connect iphone with fiddler on mac (virtual machine win 10) it works fine.

But when I connect iphone with fiddler on a windows pc. It doesnt work at all.

This used to work for me when I had another modem. 

So router:
pc1
mac


Iphone wifi mac ->fiddler mac (virtualbox ok)

iphone wifi mac -> fiddler pc  ( not ok )

This used to work for me, but I dont know why It doesnt work anymore, Im sure it has to do with the router/modem
Before was a motorola now its a shitty thompson

Having an issue maybe I just need some ideas how to check.. have this mobile app that gets pushed a notification somehow to pull requests from a service (api), I have configured a fiddler proxy as the only means for the device having the app to reach the internet.  When a notification comes so the app can reach for info I don't see any evidence of this on fiddler session logs, is there any way of seeing this somewhere without having to use more tools like wireshark? reason is https decryption seems little more complex there.  Next issue is once the app reaches for info and send the request (the app does the request multiple times over a period of time to get the most updated info while waiting for user's action), and I'm tampering the response making sure I use "oSession.bBufferResponse = true;" in the "OnPeekAtResponseHeaders" for that method so response is not streamed to the client first then changing the response in the "OnBeforeResponse" method but it seems by visual observations the modified response doesn't get passed to the client until the 2nd or 3rd request, sometime you can observe the response displayed in the client is the unmodified one even though in the logs I can see I successfully tampered all the responses for all the requests.  I'm looking for ideas on how to realize if I'm doing something wrong.

Thanks for whoever can give me a hand.

I would like to connect to a HTTP Proxy with Fiddler Core.

I'm using the 

code to do it.

Now authentication is needed for the proxy. I see in other question a solution. It says:

Where the hash at the end is the Base64 coding of the 'username:password'

My question about this workaround:

 
It results a HTTP_PROXY_AUTHORIZATION HTTP header to my requests. Not just from fiddler to the proxy, but also from the proxy to the web.
Shouldn't it be removed by the proxy? As it says here? https://tools.ietf.org/html/rfc7235#section-4.4
Is there a workaround with FiddlerCore so I can connect a HTTP Proxy with credentials without HTTP headers?

NOTE:

When I use Proxifier to connect the same proxy it works without the headers being visible by the websites