Hi Eric,

Thanks for the fiddler tool.

Actually i want to automatically export fiddler data to my pc  and i don't know how to do this.

So i request you to please help me in this.

 

 

Regards

Anshu

How can i use a upstream proxy conditionally according response header content length?

Thanks!

Regards everybody... i have a program here made by my friend to help me with some games (it's almost a cheat) but he has a hwid lock in it, but i would like to see where the info goes to... the problem is: his software, everytime that detects the word "fiddler" or other programs like this, closes. How could i hide the Fiddler from that? I really need to see it... thanks from now

     We have a Windows Server 2008 R2 that hosts an ASP.Net Web API. This Web API makes a series of 3 calls to a SOAP Web Service running in a different ASP.Net application on the same server.

One of our developers installed Fiddler on the server to debug the calls from the Web API to the Web Service.

After debugging and uninstalling Fiddler v5.0.20182.28034 for .NET 4.6.1, calls from the Web API are still being directed to the 127.0.0.1:8888 proxy address.

We have reinstalled Fiddler and started and Stopped it gracefully to be sure the Internet Options are being set back. 

We have searched the Web API application directory and its Web.config file for a defaultProxy setting.

We have searched the entire Microsoft.Net directory in Windows and all machine.config and Web.config (even *.config) files for any defaultProxy setting and have found only '<proxy usesystemdefault="true" />' yet after repeated reboots and install/uninstall of Fiddler, we cannot get the Web API to work without Fiddler installed and running on the server.

As soon as we shut Fiddler down, the Web API calls to the Web Service begin to fail with the error "...target machine actively refused it 127.0.0.1:8888"

Can you help me determine what is happening?

Thanks in advance.

Hi

trying to monitor my phone traffic via a fiddler running in windows EC2 machine.

I setup Fiddler on a windows machine in EC2, I have enabled allow remote connection and I have open port 8888 on windows firewall and AWS firewall.

I point my phone network proxy to public IP for that machine and the right port.

When I open ://<public ip>:8888 on the phone, it never returned with the Fiddler echo page.

I noticed that in Fiddler there is a traffic coming in but it never complete and seems duplicated (loop).

I suspect that the fiddler echo page  listen to the public and only private IPs.

Can someone guide me where can I change that setting or what step have I missed?

Hello,

I host remote FiddlerCore instance for remote debugging/etc. Obviously this is a bad idea, but I am trying to lockdown my instance from unauthorized users as an open proxy.

 

Ideally it would be through firewall/iptables, but since ip changes it is not very useful to me.

 

I would like to add proxy authentication, but iOS does not send "proxy-authorization"/"proxy-authentication" header, instead a proxy authentication challenge must be presented.

Is this possible with FiddlerCore? Any other tips for locking down this instance?

First of all, thanks a lot for this amazing framework. I have developed a small tool (c#) to intercept requests to a server and give them a local response using the LoadResponseFromFile method. This works nicely with both HTTP and HTTPS requests. Though, with HTTPS, I would have to let the first request pass to the server. I want to make it so that the tool would do without that. From my basic understanding, if I am not wrong, this has something to do with the original handshake. All subsequent requests can be handled without fuss.

Now, I went to the Fiddler tool and tries to trace this. The request that I cannot seem to handle, i.e. the first request, is displayed as:

200 HTTP Tunnel To x.x.x:443

where x.x.x is the server. The body size is 0. On Raw tab, I get:

HTTP/1.1 200 Connection Established

and some lines under it, Encrypted HTTPS traffic flows through this CONNECT tunnel. HTTPS Decryption is enabled in Fiddler, so decrypted sessions running in this tunnel will be shown in the Web Sessions list plus some other data.

Can you guide me in the right direction on how to handle those requests locally without having to rely on the server?

 

Regards and thanks.

When attempting to save a fiddler trace session file using FiddlerCap the 'Save Captures' dialog is unable to open and throws the following exception:

See the end of this message for details on invoking 
just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************
System.Runtime.InteropServices.COMException (0x80040111): Creating an instance of the COM component with CLSID {C0B4E2F3-BA21-4773-8DBA-335EC946EB8B} from the IClassFactory failed due to the following error: 80040111 ClassFactory cannot supply requested class (Exception from HRESULT: 0x80040111 (CLASS_E_CLASSNOTAVAILABLE)).
   at System.Windows.Forms.SaveFileDialog.CreateVistaDialog()
   at System.Windows.Forms.FileDialog.RunDialogVista(IntPtr hWndOwner)
   at System.Windows.Forms.CommonDialog.ShowDialog(IWin32Window owner)
   at FiddlerCap2.frmMain.(Object , EventArgs ) in C:\JenkinsHome\jobs\FiddlerCapReleaseBuild\workspace\FiddlerCap\FiddlerCap\MainForm.cs:line 214
   at System.Windows.Forms.Control.OnClick(EventArgs e)
   at System.Windows.Forms.Button.OnClick(EventArgs e)
   at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ButtonBase.WndProc(Message& m)
   at System.Windows.Forms.Button.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)


************** Loaded Assemblies **************
mscorlib
    Assembly Version: 4.0.0.0
    Win32 Version: 4.7.3110.0 built by: NET472REL1LAST_C
    CodeBase: file:///C:/Windows/Microsoft.NET/Framework64/v4.0.30319/mscorlib.dll
----------------------------------------
FiddlerCap
    Assembly Version: 4.6.20182.28033
    Win32 Version: 4.6.20182.28033
    CodeBase: file:///C:/Windows/SysWOW64/config/systemprofile/Desktop/FiddlerCap/FiddlerCap.exe
----------------------------------------
System.Windows.Forms
    Assembly Version: 4.0.0.0
    Win32 Version: 4.7.3056.0 built by: NET472REL1
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Windows.Forms/v4.0_4.0.0.0__b77a5c561934e089/System.Windows.Forms.dll
----------------------------------------
System
    Assembly Version: 4.0.0.0
    Win32 Version: 4.7.3056.0 built by: NET472REL1
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System/v4.0_4.0.0.0__b77a5c561934e089/System.dll
----------------------------------------
System.Drawing
    Assembly Version: 4.0.0.0
    Win32 Version: 4.7.3056.0 built by: NET472REL1
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Drawing/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll
----------------------------------------
System.Configuration
    Assembly Version: 4.0.0.0
    Win32 Version: 4.7.3056.0 built by: NET472REL1
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Configuration/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll
----------------------------------------
System.Core
    Assembly Version: 4.0.0.0
    Win32 Version: 4.7.3110.0 built by: NET472REL1LAST_C
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Core/v4.0_4.0.0.0__b77a5c561934e089/System.Core.dll
----------------------------------------
System.Xml
    Assembly Version: 4.0.0.0
    Win32 Version: 4.7.3056.0 built by: NET472REL1
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Xml/v4.0_4.0.0.0__b77a5c561934e089/System.Xml.dll
----------------------------------------

************** JIT Debugging **************
To enable just-in-time (JIT) debugging, the .config file for this
application or computer (machine.config) must have the
jitDebugging value set in the system.windows.forms section.
The application must also be compiled with debugging
enabled.

For example:

<configuration>
    <system.windows.forms jitDebugging="true" />
</configuration>

When JIT debugging is enabled, any unhandled exception
will be sent to the JIT debugger registered on the computer
rather than be handled by this dialog box.

Is there any way we can access client code, inner HTML or control events using Fiddler core?

I have Fiddler v5 set up on Windows 10. I have followed the instructions for capturing iOS traffic detailed here, http://docs.telerik.com/fiddler/configure-fiddler/tasks/ConfigureForiOS

When Windows is not on a VPN, I can capture the traffic from my iPhone 8 with iOS 12.1 via Manual proxy setting and port 8888. However, when I connect to a VPN (Pulse Secure Network Connect 8.3) and then start up Fiddler, running as Administrator, I can then no longer load web pages in Safari on my iPhone and Fiddler doesn't capture any iOS traffic.

On the Tools > Options > Connections settings, I do have "Monitor all connections" checked.

What could prevent the proxy from working while on the VPN?

Thanks,

Nate