Am i able to collect data from my phone via fiddler without using WIFI? I prefer the high speed internet a cable provides me with, but i am unsure where to put in my proxy settings in the phone if i do decide to use a ethernet cable to connect to the internet 

Hi Team,

I have installed fiddler on my company laptop

From my laptop I am able to see the Fiddler Echo Service Page, even I can see all the traffic running on my laptop.

But when I try to connect my android mobile( connected to the same wifi which laptop connected and also able to ping my mobile device) and do proxy changes

I don't see the fiddler echo service page in my mobile

I don't see any mobile traffic on Fiddler

Mobile is not able to access internet

Can anyone help me with this issue?

There is some command line tools or handlers to save the traffic and filtering while run?

I need to run automation tests and save the traffic captured of the tests failed. My idea was to save every time a file is created in a specific folder (meaning test failed) and ignore those ones passed, in a way of fiddler is open and close every time a test is started and finish respectively.

Best regards,

Salvado

 

 

Hi,

  I downloaded Fiddler Classic v5.0.20202.18177.  When I attempt to install it, it stops working at the Setup Helper step.  A message appears that reads "Fiddler.SetupHelper has stopped working".  If I click 'Close Program', a warning dialog appears that reads "error code: 255.  Please add Progress Telerik Fiddler's installation directory to your PATH environment variable if you want to be able to start Progress Telerik Fiddler from the Windows' Run dialog."

  After closing that dialog, Fiddler appears to finish installing.  However, although it is listed in the Control Panel's installed programs, it does not start up after I click the application executable.

  I have tried adding the installation directory to my PATH environment variable and restarting my PC, but it does the same thing.  I have tried uninstalling it, and reinstalling, but to no avail.  I have tried turning off my firewall, uninstalling it, and installing it, all while the installation directory was added to my PATH environment variable.  I have tried installing it to my Desktop instead of the default directory.  I have tried fresh downloads of Fiddler Classic.  I have tried installing it while my anti-virus is disabled.  At this point, I'm not sure what else to try; any help would greatly be appreciated.  I'd really like to give this program a go, because I've heard good things about it.  I'm including the installation details below, as well as several screenshots.

  Thanks in advance for your help!

 

 

Output folder: C:\Users\Sam\AppData\Local\Programs\Fiddler
No older version of Progress Telerik Fiddler was found.
.NETv4 Framework Key found.
Compatible .NET Framework/Service Pack found.
Installing Progress Telerik Fiddler
Extract: Fiddler.exe
Extract: Fiddler.exe.config
Extract: Fiddler.pdb
Extract: SetupHelper
Extract: TrustCert.exe
Extract: TrustCert.pdb
Installing Dependencies...
Extract: Be.Windows.Forms.HexBox.dll
Extract: Analytics.dll
Extract: Analytics.pdb
Extract: GA.Analytics.Monitor.dll
Extract: GA.Analytics.Monitor.pdb
Extract: Newtonsoft.Json.dll
Extract: Xceed.FileSystem.v5.4.dll
Extract: Xceed.Zip.v5.4.dll
Extract: Xceed.Compression.v5.4.dll
Extract: Xceed.Compression.Formats.v5.4.dll
Extract: App.ico
Extract: Countdown.wav
Extract: LoadScript.wav
Extract: LoadScriptError.wav
Extract: Screenshot.wav
Extract: credits.txt
Extract: saz.ico
Output folder: C:\Users\Sam\AppData\Local\Programs\Fiddler\ResponseTemplates
Extract: 200_FiddlerGif.dat
Extract: 200_SimpleHTML.dat
Extract: 200_TransPixel.dat
Extract: 204_NoContent.dat
Extract: 302_Redirect.dat
Extract: 303_RedirectWithGet.dat
Extract: 304_NotModified.dat
Extract: 307_RedirectWithMethod.dat
Extract: 401_AuthBasic.dat
Extract: 401_AuthDigest.dat
Extract: 403_AuthDeny.dat
Extract: 404_Plain.dat
Extract: 407_ProxyAuthBasic.dat
Extract: 502_Unreachable.dat
Output folder: C:\Users\Sam\AppData\Local\Programs\Fiddler\Scripts
Extract: SampleRules.cs
Output folder: C:\Users\Sam\AppData\Local\Programs\Fiddler\Tools
Extract: Brotli.exe
Extract: JXR2PNG.exe
Extract: JXR2PNG.exe.config
Extract: Zopfli.exe
Extract: dwebp.exe
Output folder: C:\Users\Sam\AppData\Local\Programs\Fiddler
Extract: license.txt
Extract: makecert.exe
Output folder: C:\Users\Sam\AppData\Local\Programs\Fiddler\Scripts
Extract: SampleRules.js
Output folder: C:\Users\Sam\AppData\Local\Programs\Fiddler
Extract: ExecAction.exe
Extract: ForceCPU.exe
Output folder: C:\Users\Sam\AppData\Local\Programs\Fiddler
Installing NetworkConnections...
Extract: Telerik.NetworkConnections.dll
Output folder: C:\Users\Sam\AppData\Local\Programs\Fiddler\Plugins\NetworkConnections
Extract: Telerik.NetworkConnections.Windows.dll
Output folder: C:\Users\Sam\AppData\Local\Programs\Fiddler\Inspectors
Installing Progress Telerik Fiddler inspectors
Extract: Standard.dll
Extract: SyntaxView.dll
Extract: QWhale.Common.dll
Extract: QWhale.Editor.dll
Extract: QWhale.Syntax.dll
Extract: QWhale.Syntax.Schemes.dll
Installing tools...
Output folder: C:\Users\Sam\AppData\Local\Programs\Fiddler\Tools
Extract: PngDistill.exe
Extract: PngDistill.pdb
Installing FiddlerExtensions...
Output folder: C:\Users\Sam\AppData\Local\Programs\Fiddler\Scripts
Extract: SimpleFilter.dll
Extract: SimpleFilter.pdb
Extract: Timeline.dll
Extract: Timeline.pdb
Extract: RulesTab2.dll
Extract: QWhale.Common.dll
Extract: QWhale.Editor.dll
Extract: QWhale.Syntax.dll
Extract: QWhale.Syntax.Parsers.dll
Installing Fiddler Orchestra addon...
Extract: FiddlerOrchestra.Addon.dll
Extract: FiddlerOrchestra.Addon.pdb
Extract: FiddlerOrchestra.Connection.dll
Extract: FiddlerOrchestra.Protocol.dll
Extract: FiddlerOrchestra.Utilities.dll
Extract: netstandard.dll
Installing Fiddler Script Editor...
Output folder: C:\Users\Sam\AppData\Local\Programs\Fiddler\ScriptEditor
Extract: FSE2.exe
Extract: FSE2.exe.config
Extract: QWhale.Common.dll
Extract: QWhale.Editor.dll
Extract: QWhale.Syntax.dll
Extract: QWhale.Syntax.Parsers.dll
Extract: Analytics.dll
Extract: Analytics.pdb
Extract: GA.Analytics.Monitor.dll
Extract: GA.Analytics.Monitor.pdb
Output folder: C:\Users\Sam\AppData\Local\Programs\Fiddler\ImportExport
Extract: BasicFormats.dll
Extract: BasicFormats.pdb
Extract: VSWebTestExport.dll
Extract: VSWebTestExport.pdb
Write x64 HKLM Keys
Output folder: C:\Users\Sam\AppData\Local\Programs\Fiddler
Create shortcut: C:\Users\Sam\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Fiddler 4.lnk
Create shortcut: C:\Users\Sam\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Fiddler ScriptEditor.lnk
Registering Windows Firewall Exception for inbound traffic...
ExecShell: C:\Windows\system32\netsh.exe
ExecShell: C:\Windows\system32\netsh.exe
Invoking DotNet4 64bit NGEN
ExecShell: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\ngen.exe
ExecShell: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\ngen.exe
Execute: "C:\Users\Sam\AppData\Local\Programs\Fiddler\SetupHelper" /a "C:\Users\Sam\AppData\Local\Programs\Fiddler"
Output folder: C:\Users\Sam\AppData\Local\Programs\Fiddler
Extract: uninst.exe
Refreshing icons...
Completed

     Dear all,

I downloaded now fre (without paying) Fiddler to do some post tests, but as now I don't know how to enter username and password to authenticate to web service address, that was given to me. As I'm new completely to Fiddler, can anyone help me, please? I read that I need to enter Tools and something else, but I don't find it. Is tools menu under payments?

 

Thanks

 

Francesco

Some servers react differently depending on the Client Hello. Is there some way to mimic the hello of applications like Chrome?
Chrome for example uses its own ssl library which for example provides GREASE. Which library does Fiddler use on a Linux system ?

I found: https://www.telerik.com/blogs/fiddler-and-modern-tls-versions

Which seems to go a bit in the direction of customizing the client-server connection. Is it possible to use selected ciphers and extensions?

For reference:
https://github.com/refraction-networking/utls
https://engineering.salesforce.com/tls-fingerprinting-with-ja3-and-ja3s-247362855967

My english is bad, sorry

I tried to crack traffic on Fiddler but it doesn't show up, why did I have such a problem

I get the following exception on both of my computers - one with OS Win10 2004, one with Win10 1909.

With version 4.6.20171.14978 everything works fine. But when installing the current version (even a clean install) fiddler fails at startup with a message that states that a foldername is invalid.

I tried to run it as administrator, as normal user, after several resatarts and on two computers - it's always the same. Other topics in the forum didn't help.

Here is the exception:

 

---------------------------
Awww, Fiddlesticks!
---------------------------
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.

Bei der Komposition ist ein Kompositionsfehler aufgetreten. Die Ursache wird unten angegeben. Die CompositionException.Errors-Eigenschaft liefert genauere Informationen.

1) Der Verzeichnisname ist ungültig

Ergebnis: Ausnahme beim Erstellen einer Instanz vom Typ "Telerik.NetworkConnections.NetworkConnectionsManager".

Ergebnis: Teil "Telerik.NetworkConnections.NetworkConnectionsManager" kann nicht aktiviert werden.

Element: Telerik.NetworkConnections.NetworkConnectionsManager -->  Telerik.NetworkConnections.NetworkConnectionsManager -->  AssemblyCatalog (Assembly="Telerik.NetworkConnections, Version=0.1.2.0, Culture=neutral, PublicKeyToken=67cb91587178ac5a")

Ergebnis: Export "Telerik.NetworkConnections.NetworkConnectionsManager (ContractName="Telerik.NetworkConnections.NetworkConnectionsManager")" kann nicht aus dem Teil "Telerik.NetworkConnections.NetworkConnectionsManager" abgerufen werden.

Element: Telerik.NetworkConnections.NetworkConnectionsManager (ContractName="Telerik.NetworkConnections.NetworkConnectionsManager") -->  Telerik.NetworkConnections.NetworkConnectionsManager -->  AssemblyCatalog (Assembly="Telerik.NetworkConnections, Version=0.1.2.0, Culture=neutral, PublicKeyToken=67cb91587178ac5a")

Type: System.ComponentModel.Composition.CompositionException
Source: System.ComponentModel.Composition
   bei System.ComponentModel.Composition.Hosting.CompositionServices.GetExportedValueFromComposedPart(ImportEngine engine, ComposablePart part, ExportDefinition definition)

   bei System.ComponentModel.Composition.Hosting.CatalogExportProvider.GetExportedValue(CatalogPart part, ExportDefinition export, Boolean isSharedPart)

   bei System.ComponentModel.Composition.Primitives.Export.get_Value()

   bei System.ComponentModel.Composition.ExportServices.GetCastedExportedValue[T](Export export)

   bei Fiddler.Proxy.() in C:\Jenkins\Fiddler_Windows\workspace\FiddlerCore\FiddlerCore.Shared\Common\Core\Proxy.cs:Zeile 283.

   bei Fiddler.Proxy..ctor(Boolean isPrimary, ProxySettings upstreamProxySettings) in C:\Jenkins\Fiddler_Windows\workspace\FiddlerCore\FiddlerCore.Shared\Common\Core\Proxy.cs:Zeile 210.

   bei Fiddler.frmViewer.‹•(String[] ˆ•) in C:\Jenkins\Fiddler_Windows\workspace\Fiddler2\Fiddler.Shared\Viewer.cs:Zeile 3339.

   bei Fiddler.frmViewer.‡•(String[] ˆ•) in C:\Jenkins\Fiddler_Windows\workspace\Fiddler2\Fiddler.Shared\Viewer.cs:Zeile 3164.

Fiddler v5.0.20202.18177 (x64 AMD64) [.NET 4.0.30319.42000 on Microsoft Windows NT 10.0.19041.0] 
---------------------------
OK   
---------------------------

Fiddler 5.0.20202 crashes on start on ReactOS 

Additional information is here https://jira.reactos.org/browse/CORE-17175

 

Could please you give a hint, the problem in which Windows library can cause such an error as shown on the screenshot?

 

ReactOS is a free and open-source operating system for amd64/i686 personal computers intended to be binary-compatible with computer programs and device drivers made for Windows  XP\ Server 2003

 

 

i am using fiddler to sniff HTTP traffics on mobile
but the app is forbidden for my IP and region and i need use v p n to
can use app
so my question is how can i use v p n on my phone for that?Because if i
open a v p n,the connection with fiddler will disconnect and fiddler
cant debug the traffics