Hello, i'm working on python script and when I want to stop Fiddler from module subprocess (or taskkill from windows) fiddler keeps running(and his proxy enabled) My question is there anyway quit it properly from external methods ? Thanks.

I have installed Mono 5.2.0 for OSX and MonoFiddler 4.4.8.4 Built for Linux, and I also run mozroots —import —sync for HTTPS, however, when I run mono Fiddler.exe , it said "NameError: name 'lldb' is not defined" 
"Got a SIGSEGV while executing native code. This usually indicates
a fatal error in the mono runtime or one of the native libraries
used by your application."    

and the mono process exited unexpectedly!

and I want to know why.. 

 

 

hi, how can i disable fiddler4 follow last line ?

Hello,

 

I've been using FiddlerCore on Windows for some time now and it's been great. However some of my users have recently started to report

issues where the proxy fails to connect to anything. I've checked the logs and every time this user happens is because of BCCertMaker.

This is what's shown in the log:

Fiddler.BCCertMaker> Failed to create certificate for localhost: Key not valid for use in specified state. at System.Security.Cryptography.Utils.CreateProvHandle(CspParameters parameters, Boolean randomKeyContainer) at System.Security.Cryptography.Utils.GetKeyPairHelper(CspAlgorithmType keyType, CspParameters parameters, Boolean randomKeyContainer, Int32 dwKeySize, SafeProvHandle& safeProvHandle, SafeKeyHandle& safeKeyHandle) at System.Security.Cryptography.RSACryptoServiceProvider.GetKeyPair() at System.Security.Cryptography.RSACryptoServiceProvider..ctor(Int32 dwKeySize, CspParameters parameters, Boolean useDefaultKeySize) at BCCertMaker.BCCertMaker.ConvertBCPrivateKeyToDotNet(RsaPrivateCrtKeyParameters bcPVK, String sKeyName) at BCCertMaker.BCCertMaker.CreateCertificateFromCA(String sCN, X509Certificate caCert, AsymmetricKeyParameter caKey) at BCCertMaker.BCCertMaker.MakeNewCert(String sHostname)

 

I've done research on this error and it's not clear what it's cause is but I've found that it can be solved by deleting

the "Crypto" folder in %AppData%\Microsoft\. This is clearly not ideal and would appreciate if someone had an idea on how to work

around this issue in the future.

 

Thanks.

Hi,

I couldn't find where I can customize rules on Fiddler 0.3.0, is this available?

Thanks,

Jzy

I have been trying to get Fiddler configured to decrypt HTTPS traffic on a Citrix image.  We need this for diagnostics\troubleshooting an issue we are having.  When I run through the process to Trust the Root Certificate I get the normal SCARY message and when I choose "Yes" I get an error about being unable to configure Windows to Trust the Fiddler Root Certificate.  Here are the details in the log:

-= Fiddler Event Log =-
See http://fiddler2.com/r/?FiddlerLog for details.

07:56:11:3776 Fiddler Running...
07:56:11:3932 Windows 8+ AppContainer isolation feature detected.
07:56:17:9514 Assembly 'C:\Program Files (x86)\Fiddler2\CertMaker.dll' was not found. Using default Certificate Generator.
07:56:17:9514 /Fiddler.CertMaker> Using .‰+˜ for certificate generation; UseWildcards=True.
07:56:21:2343 DefaultCertMaker: GetRootCertificate() did not find the root in the Windows TrustStore.
07:56:21:2343 /Fiddler.CertMaker> Caller was in ApartmentState: STA; hopping to Threadpool
07:56:21:2343 /Fiddler.CertMaker> Invoking CertEnroll for Subject: CN=DO_NOT_TRUST_FiddlerRoot, O=DO_NOT_TRUST, OU=Created by http://www.fiddler2.com; Thread's ApartmentState: MTA
07:56:21:2850 !ERROR: Failed to generate Certificate using CertEnroll. System.Reflection.TargetInvocationException Exception has been thrown by the target of an invocation. < CertEnroll::CX509PrivateKey::Create: The profile for the user is a temporary profile. 0x80090024 (-2146893788 NTE_TEMPORARY_PROFILE)
07:56:24:4304 DefaultCertMaker: GetRootCertificate() did not find the root in the Windows TrustStore.
07:56:24:4304 !Fiddler.CertMaker> The Root certificate could not be found.
07:58:00:3753 Setting upstream gateway to none
07:58:16:7514 DefaultCertMaker: GetRootCertificate() did not find the root in the Windows TrustStore.
07:58:16:7514 !Fiddler.CertMaker> The Root certificate could not be found.
07:58:29:0623 DefaultCertMaker: GetRootCertificate() did not find the root in the Windows TrustStore.
07:58:29:0623 !Fiddler.CertMaker> The Root certificate could not be found.
08:03:20:0051 DefaultCertMaker: GetRootCertificate() did not find the root in the Windows TrustStore.
08:03:20:0051 /Fiddler.CertMaker> Caller was in ApartmentState: STA; hopping to Threadpool
08:03:20:0051 /Fiddler.CertMaker> Invoking CertEnroll for Subject: CN=DO_NOT_TRUST_FiddlerRoot, O=DO_NOT_TRUST, OU=Created by http://www.fiddler2.com; Thread's ApartmentState: MTA
08:03:20:0051 !ERROR: Failed to generate Certificate using CertEnroll. System.Reflection.TargetInvocationException Exception has been thrown by the target of an invocation. < CertEnroll::CX509PrivateKey::Create: The profile for the user is a temporary profile. 0x80090024 (-2146893788 NTE_TEMPORARY_PROFILE)
08:03:39:1731 DefaultCertMaker: GetRootCertificate() did not find the root in the Windows TrustStore.
08:03:39:1731 !Fiddler.CertMaker> The Root certificate could not be found.
08:03:46:3336 DefaultCertMaker: GetRootCertificate() did not find the root in the Windows TrustStore.
08:03:46:3336 /Fiddler.CertMaker> Caller was in ApartmentState: STA; hopping to Threadpool
08:03:46:3336 /Fiddler.CertMaker> Invoking CertEnroll for Subject: CN=DO_NOT_TRUST_FiddlerRoot, O=DO_NOT_TRUST, OU=Created by http://www.fiddler2.com; Thread's ApartmentState: MTA
08:03:46:3336 !ERROR: Failed to generate Certificate using CertEnroll. System.Reflection.TargetInvocationException Exception has been thrown by the target of an invocation. < CertEnroll::CX509PrivateKey::Create: The profile for the user is a temporary profile. 0x80090024 (-2146893788 NTE_TEMPORARY_PROFILE)
10:06:29:9758 DefaultCertMaker: GetRootCertificate() did not find the root in the Windows TrustStore.
10:06:29:9758 !Fiddler.CertMaker> The Root certificate could not be found.

Hi everyone,

I finally figured out how to capture traffic with Telerik Fiddler on my Android device. I can capture websites such as telerik.com but I can't get the POST/GET requests of a app. How can I fix this?

 

Thanks.

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.

Hi Guys, I have recently downloaded Fiddler. The program itself is great but whenever I close it and I start epic games then there is always a mistake that is not Internet connection. But as soon as I reopen Fiddler, epic games has a connection. Maybe you know what I have to do so that I can start epic games again without fiddler? Thanks in advance