Installing Fiddler, downloaded from the "only" Download link for Win. I have a Win7 VM (not native Win), which didn't have any .NET installed. I had 4.5.2 available, so I installed that. Then installed Fiddler, which failed with error on start. Analysing the error, I found out that installer had given me  Fiddler v2.6.3.49793. Tried to install .NET v2, but it didn't go in. Tried to install .NET v4.0 but that refused to install as well. I needed to uninstall .NET 4.5.2, and then install .NET 4.0 (a lot of boots and struggle there). Finally with .NET v4.0 I uninstalled Fiddler and re-installed, to get v4 of Fiddler. Then it worked.

Just wanted to share - if somebody else stumbles upon the same problem.

The error Fiddler 2 gave was: "Type: System.ArgumentException, Source: mscorlib...."

Is this how you wanted it to behave like ?

 

When using O365 extension and trying ws-fed auth to O365 fiddler chrashes, fiddler works alright when disabling extension

---------------------------
Uncaught Exception in Session #387
---------------------------
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.

Length cannot be less than zero.

Parameter name: length

Type: System.ArgumentOutOfRangeException
Source: mscorlib
   at System.String.Substring(Int32 startIndex, Int32 length)

   at EXOFiddlerInspector.SessionProcessor.SetAuthentication(Session session)

   at EXOFiddlerInspector.Services.ActivationService.AutoTamperResponseAfter(Session _session)

   at Fiddler.FiddlerExtensions.(Session ) in C:\Jenkins\Fiddler_Windows\workspace\Fiddler2\Common\Application\Extensions.cs:line 866

   at Fiddler.Session.‘() in C:\Jenkins\Fiddler_Windows\workspace\Fiddler2\Common\Core\Session.cs:line 4073

   at Fiddler.ServerChatter.ŽŒ() in C:\Jenkins\Fiddler_Windows\workspace\Fiddler2\Common\Core\ServerChatter.cs:line 1520

   at Fiddler.ServerChatter.Œ() in C:\Jenkins\Fiddler_Windows\workspace\Fiddler2\Common\Core\ServerChatter.cs:line 1474

   at Fiddler.Session.‘() in C:\Jenkins\Fiddler_Windows\workspace\Fiddler2\Common\Core\Session.cs:line 3751

   at Fiddler.Session.(Object ) in C:\Jenkins\Fiddler_Windows\workspace\Fiddler2\Common\Core\Session.cs:line 3526


Fiddler v5.0.20194.41348 (x64 AMD64) [.NET 4.0.30319.42000 on Microsoft Windows NT 10.0.18363.0]
---------------------------
OK   
---------------------------

Hi,

I reviewed prior posts and I see that this question has been asked before but either I don't fully understand the solution or my problem is slightly different.  I am attempting to user Fiddler with SSL decryption enabled to visit a site that we use for a vendor product (which is based in Flash).   I am able to access alot of other HTTPs sites (such as Google, Paypal, etc.) and view the resulting traffic, but I cannot access this particular site that I need.

I installed Fiddler today so I have the newest copy.

I see the following log entry when I try to access the site:


The SSL certificate is in the trusted root store.    When I attempt to visit the site, I am prompted to accept the untrusted certificate and then IE attempts to load the page for quite some time and never gets through.   I also tried in Chrome just to make sure this wasn't a browser-specfic problem.

I think I am very close and just need a little help to get through.   Please let me know any information I can provide to get to the bottom of this.  Thank you in advance. 

I downloaded the "fiddler...dmg" and installed it. When I try to run it, I get this error "“Progress Telerik Fiddler” can’t be opened because Apple cannot check it for malicious software.".

Is this ready for MacOS at this point. I can't disable the verification in a corporate environment.

Now what?

I had trouble using Fiddler for iOS in localhost env.

( PC browser（IE) and Android are OK !)

 

A heavy request posts to server in iOS,

but Fuddler capture request twice.

dose anyone some idea?

 

like this:

-------------------------------------------

# Result  Protocol　Host　URL 

↓              HTTPS　AAA　test/RestAAA

   200       HTTP      Tunnel to AAA:443

  500       HTTPS　AAA　test/RestAAA     ←not expectation

-------------------------------------------

after , first HTTPS request is return 200,and Collect Json Data.

 

:)

I am trying to get Fiddler running on a Mac and I keep getting the error that my connection is not private and I can't navigate to any sites, therefore rending Fiddler useless.  I've searched through the forums, but all of the solutions I've found have been for the Windows version.  I have verified that the "Decrypt HTTPS" box is checked, but if there's more that needs to be done on the Mac version, I have not found it.

I'm trying to parse some data from a socket in C#. The socket uses the Permessage-Deflate extension. While the packet types are all text, some of the packets show illegible characters. 

 

If I select a packet and go to the HexView tab, I can right-click the packet, choose Copy/Copy as Base64, paste it into the TextWizard and then transform it from DeflatedSAML. This parsed the packet perfectly. 

 

What is being done here in terms of encodings etc in C# equivalent code? I can't seem to go from a string received as a packet in C# to getting the same result as those steps in Fiddler, no matter what options in terms of encoding or decompression I cycle through. . . 

Is there a 'flag' byte at the start of a packet that indicates whether a packet contains plain text or compressed data, out of interest?

I'd appreciate any pointers at all on this. 

Hi,

I'm making an api call and trying to modify the status code in the https response but the response is failing without returning a status code and I'm also getting a ERR_TUNNEL_CONNECTION_FAILED.

I can see my https request coming in. Also managed to modify/add headers on the response to test if my code in the ScriptEditor works - works fine.

NOTE: The status code changes also works fine for http request.

 

I am probably missing something simple, here is the code below. For testing I also checked other https calls from different sites and the same is happening.

In OnBeforeResponse I have: oSession.responseCode = 500;

 

Any ideas?

Thanks

Hello guys, i am using fiddlercore4 and selenium, i am setting chromes proxy server to a custom proxy, but it prevents fiddler from working. It is mandatory for me to add proxies into my software, any reason to why this is happening?

 

log are as follows

---------------------------
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.

无法加载或初始化请求的服务提供程序。

Type: System.Net.Sockets.SocketException
Source: System
   在 System.Net.SafeCloseSocketAndEvent.CreateWSASocketWithEvent(AddressFamily addressFamily, SocketType socketType, ProtocolType protocolType, Boolean autoReset, Boolean signaled)

   在 System.Net.NetworkInformation.NetworkChange.AddressChangeListener.StartHelper(NetworkAddressChangedEventHandler caller, Boolean captureContext, StartIPOptions startIPOptions)

   在 System.Net.NetworkInformation.NetworkChange.AvailabilityChangeListener.Start(NetworkAvailabilityChangedEventHandler caller)

   在 Fiddler.Proxy..ctor(Boolean isPrimary, ProxySettings upstreamProxySettings) 位置 C:\Jenkins\Fiddler_Windows\workspace\Fiddler2\Common\Core\Proxy.cs:行号 209

   在 Fiddler.frmViewer.‹•(String[] ˆ•) 位置 C:\Jenkins\Fiddler_Windows\workspace\Fiddler2\Viewer.cs:行号 2940

   在 Fiddler.frmViewer.‡•(String[] ˆ•) 位置 C:\Jenkins\Fiddler_Windows\workspace\Fiddler2\Viewer.cs:行号 2758


Fiddler v5.0.20194.41348 (x64 AMD64) [.NET 4.0.30319.42000 on Microsoft Windows NT 10.0.18362.0] 
---------------------------
确定   
---------------------------

How to solve this problem？