I have downloaded fiddler and mono and put fiddler on my desktop

and when get to the step of mono Fiddler.exe, it says 

Cannot open assembly 'Fiddler.exe': No such file or directory.

Please help!

Thanks

Hi there,

I got the following error on the first launching Fiddler after installed it on windows 10:

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


There is an error in XML document (0, 0).


Type: System.InvalidOperationException
Source: System.Xml
   at System.Xml.Serialization.XmlSerializer.Deserialize(XmlReader xmlReader, String encodingStyle, XmlDeserializationEvents events)


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


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


   at Fiddler.frmViewer.š(Object , EventArgs ) in C:\JenkinsHome\jobs\FiddlerReleaseBuild\workspace\Fiddler2\Viewer.cs:line 9816


System.Xml.XmlException: Root element is missing.


   at System.Xml.XmlTextReaderImpl.Throw(Exception e)


   at System.Xml.XmlTextReaderImpl.ParseDocumentContent()


   at System.Xml.XmlReader.MoveToContent()


   at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationReaderList1.Read3_ArrayOfMimeMap()
Fiddler v4.6.20173.38786 (x64 AMD64) [.NET 4.0.30319.42000 on Microsoft Windows NT 10.0.10586.0]
---------------------------
OK  
---------------------------

Received this error when starting up Telerik after install

---------------------------
Generating default MIME mappings file 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.

Access to the path 'C:\Users\donnie\Documents\Fiddler2\CustomMimeMappings.xml' is denied.

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

   at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)

   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options, String msgPath, Boolean bFromProxy)

   at System.IO.FileStream..ctor(String path, FileMode mode)

   at Fiddler.frmViewer.š(Object , EventArgs ) in C:\JenkinsHome\jobs\OrchestraFiddlerReleaseBuild\workspace\Fiddler2\Viewer.cs:line 9782


Fiddler v5.0.20173.49666 (x64 AMD64) [.NET 4.0.30319.36392 on Microsoft Windows NT 6.0.6002 Service Pack 2] 
---------------------------
OK   
---------------------------

Hi,

Nuget has a package for fiddler core, I know that the user created this package is named like fiddler's developer, but still, this user can fake.

Can I trust this nuget? Was it really uploaded by Telerik?

Hello,

My company has recently started using a proxy (which I can see set in the Local Area Network (LAN) Settings dialog.

Now, when I try and proxy my traffic through Fiddler from the urllib2 python library it does not get captured by Fiddler.  However, when I turn the Windows proxy off the traffic does get captured by Fiddler.

Does any body have an idea about why this would be?  Is there some contention between the way that Windows proxies traffic and the way Fiddler proxies traffic?

Thanks,

Douglas.

the yellow warning "system proxy was changed" pop up constantly.

I use PROCESS MONITOR to monitor the proxy.

Guess What I Found. 

there is no other application alter this value but itself ! 

See the Pic.  It delete the proxy setting automatically.

I don't know what to do.

监听苹果app时提示下图信息，然后就不知道怎么弄了！

When listening to the apple app, prompt the following information, and then don't know how to do it!

Hi All,

i'd like to capture traffic to this kind of link : https://10.150.87.244/webcoding ( fiddlercore is working good with the url of this link is https://nlbp.webcoding.p04.cldsvc.net/webcoding)

I've manual added 10.150.87.244 to IE Exception when fiddlercore is running and it's working, I can access this link and can capture traffic. 

But I don't want to do that manual. Please advice (sorry for my bad Eng)

I did a load test performance for an application, and sends many requests to the server through different concurrent users. Some requests failed and returned 504. However, I'm wondering about the time factors, and don't understand the followings:

A) There is an elapsed time about 1 minute between ClientDoneRequest and ServerConnected. I try to understand why I experience this 1 minute gap, what indicates, and how to interpret it/

1) ClientDoneRequest:13:06:11.336

2) ServerConnected:13:07:11.241

B) The other question is that the serverConnected is later than ServerBeginResponse! How is it possible?

1) ServerConnected:13:07:11.241

2) ServerBeginResponse:13:07:11.134

I copied the entire timing below:

NOTE: This request was retried after a Receive operation failed.

ClientConnected:13:04:28.914
ClientBeginRequest:13:06:10.972
GotRequestHeaders:13:06:10.972
ClientDoneRequest:13:06:11.336
Determine Gateway:0ms
DNS Lookup: 0ms
TCP/IP Connect:0ms
HTTPS Handshake:52ms
ServerConnected:13:07:11.241
FiddlerBeginRequest:13:07:11.294
ServerGotRequest:13:07:11.294
ServerBeginResponse:13:07:11.134
GotResponseHeaders:00:00:00.000
ServerDoneResponse:13:08:19.817
ClientBeginResponse:13:08:19.819
ClientDoneResponse:13:08:19.819

Overall Elapsed:0:02:08.846

I have attempted to figure out this problem but cannot determine what the root cause is. Basically, I am receiving a "ReadResponse()failed: The server did not return a complete response for this request. Server returned 0 bytes." message when I perform a basic GET. In the log it shows "fiddler.network.readresponse.failure> Session #9853 raised exception System.IO.IOException The read operation failed, see inner exception. < A call to SSPI failed, see inner exception"

This only started occurring after I updated the Cipher Suites which are supported on the web server. Below are the Cipher Suites that work and the ones that don't. It seems that Fiddler needs a DES option to be available for some reason but even when I remove just one of the ciphers that use DES, the failure occurs.

Working Cipher Suite:

ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES256-SHA:ECDHE-ECDSA-DES-CBC3-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA:!DSS

Non-Working Cipher Suite:

ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:!DSS

On the web server, I see an error that states "Re-negotiation handshake failed: Not accepted by client!?". I can access the site fine through a web browser and using the first set of cipher suites but cannot with the second. Do you have any idea why removing just one of the DES suites causes this issue?