Hello,

I just downloaded and installed Fiddler on my Ubuntu 16.04 machine (Love it on my Windows machine).  Getting the Fiddler certificate installed for Chrome and Firefox was surprisingly easy (I thought I would have to do some converting).

However, when I try to add the same CER file to the system wide trusted certificates, my OS tells me that the FiddlerRoot.pem does not contain a certificate (output pasted below).  I am wondering if this is a known issue since this is still in beta phase or if I am doing something wrong.

 

I am trying to do this so when I run things through the terminal Fiddler will pick them up - specifically HTTPS requests.

 

output:

test@GPA-HSW04:/usr/lib/mono/4.5$ sudo cp '/home/test/Desktop/FiddlerRoot.cer' '/usr/share/ca-certificates/FiddlerRoot.crt'
test@GPA-HSW04:/usr/lib/mono/4.5$ sudo dpkg-reconfigure ca-certificatesProcessing triggers for ca-certificates (20160104ubuntu1) ...
Updating certificates in /etc/ssl/certs...
WARNING: FiddlerRoot.pem does not contain a certificate or CRL: skipping

Which is the last version of FiddlerCore which is free for commercial use in a non public application?

Earlier I downloaded version 2.4.0.1

Is there any newer version which is free for commercial usage? If yes, from where can I download it?

Hello.  I've got tons of experience using Fiddler but it was on my old Windows 7 machine a couple years ago.  I'm getting back to using Fiddler again, now on a Mac Book Pro, running Mojave.  When I close Fiddler, whether by clicking the close icon on the window or selecting Quit from the menu, it causes my internet to be unusable. I get proxy errors in the browsers.  I've followed directions to reset the proxies in system settings and this changes nothing.  Obviously this is a game-breaking experience.  Is there a solution?

Hi guys, 
I am pretty new on Fiddler and Wireshark and stuff like that. I try to edit a response for learning propose but many connections dont get Shown on Fiddler.
Like that one : "https://prnt.sc/r9a7ms"

May I messed something up with my settings or do I need to make some Script to get it working?

Thanks for your time guys.

Hi,

 

I am trying to capture WebSocket connection of an app in windows (Win32).

I also created a test app with websocketsharp and connected to ws://echo.websocket.org and unfortunately this was not captured in fiddler.

Any help?

 

Fiddler version: v5.0.20194.41348 for .NET 4.6.1
Built: Thursday, October 3, 2019

I have a tuned fiddler. It great was working before today morning. 
I already had such a problem and it solved itself (i don't know how). I wasn't change settings, it just stopped decrypting.

---------------------------
Loading custom MIME mappings failed
---------------------------
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.

The cloud file provider is not running.



Type: System.IO.IOException
Source: mscorlib
   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)

   at System.IO.FileStream.ReadCore(Byte[] buffer, Int32 offset, Int32 count)

   at System.IO.FileStream.Read(Byte[] array, Int32 offset, Int32 count)

   at System.Xml.XmlTextReaderImpl.InitStreamInput(Uri baseUri, String baseUriStr, Stream stream, Byte[] bytes, Int32 byteCount, Encoding encoding)

   at System.Xml.XmlTextReaderImpl..ctor(String url, Stream input, XmlNameTable nt)

   at System.Xml.Serialization.XmlSerializer.Deserialize(Stream stream)

   at Fiddler.XmlFileMimeMappings..ctor(String filePath) in C:\Jenkins\Fiddler_Windows\workspace\Fiddler2\Common\Core\MimeMapping\XmlFileMimeMappings.cs:line 40

   at Fiddler.frmViewer.š(Object , EventArgs ) in C:\Jenkins\Fiddler_Windows\workspace\Fiddler2\Viewer.cs:line 9784


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

Hello,

I don't know if I can achieve this. Basically I wanted to send requests sequentially, if response of the request is 'true', I want fiddler to autoexecute/autorespond new request. Can this be achieved?

PC is connected in a company proxy.

Fiddler is already set to act as proxy and allow remote computers to connect.

---

Here are the current fiddler settings:

* Capture HTTPS CONNECTS (checked)

* Decrypt HTTPS traffic (checked)

* Fiddler listens on port: 8888

* Capture FTP requests (checked)

* Allow remote computers to connect (checked)

* Reuse client connections (checked)

* Reuse server connections (checked)

* Act as system proxy on startup (checked)

* Monitor all connections (checked)

* Use System Proxy (recommended) is selected

---

Proxy of external device is set to the following:

Proxy Server Address: <IP address of PC with Fiddler>

Port Number: 8888

---

 

Notes:

1. I was able to capture packets when PC OS was not Windows 10.

However, no packets were captured from the connected device when OS was changed to Windows 10.

2. External device and PC is under same network.

3. I have already read existing forums and fix does not apply on this issue.

 

---

How do I configure Fiddler to capture packets from external device?

Please, help me. How to send request in code Fiddler JavaScript.net?