Ronen Zilberman

show an "Are you Sure?" popup when closing fiddler and when pressing Ctrl+X to stop accidental deletion of work

As you can imaging, this just happened...

It's too easy to lose a lot of work with a careless click or keystroke.
Additionally, there can be an override in the Options.
Feature Request by Ronen Zilberman Status: New Comments: 0 Last update: 2015-06-25T19:32:13 by Ronen Zilberman
Stefan Avramov

sign off and on on Windows 8.1 breaks the internet

If Fiddler is runnig when I sing off and back on, Fiddler is not running but I have no internet connection until I run Fiddler (I can then close it and everything is fine).
Problem by Stefan Avramov Status: New Comments: 0 Last update: 2015-06-23T09:08:15 by Stefan Avramov
Sat Stud

programmatically .pcap tp .saz

Hi. I tried convert .pcap to .saz in my .NET application but I can't find methods to do it. Is it possible to do it with FiddlerCore?
Problem by Sat Stud Status: New Comments: 0 Last update: 2015-06-06T00:49:38 by Sat Stud
Jacobus Terhorst

Can you make Fiddler 4 available as normal download? Not via, which is blocked?

Can you make Fiddler 4 available as normal download? Not via, which is blocked?
Problem by Jacobus Terhorst Status: New Comments: 0 Last update: 2015-05-22T21:34:00 by Jacobus Terhorst
Jerry Decime

TrustCert UX Flaws

At least Fiddler v4.5.1.0 on Windows 8.1 has a problem whereby the TrustCert Confirmation dialog which states: "please confirm that you wish to ADD the following certificate to your PC's Trusted Root List..." is not an actual confirmation as the DO_NOT_TRUST_FiddlerRoot is already installed into the trust store at that point. If you choose "no", the certificate remains in the trust store and the message "failed to add the root certificate to the Machine Root List" is not in fact accurate as the cert was in fact added.
Problem by Jerry Decime Status: New Comments: 0 Last update: 2015-05-21T18:57:26 by Jerry Decime
Yakov Tchenak

cannot install

Sorry, you may have found a bug...
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 using the Help | Send Feedback menu.

Could not load file or assembly 'Xceed.Zip, Version=4.5.13328.11100, Culture=neutral, PublicKeyToken=ba83ff368b7563c6' or one of its dependencies. The system cannot find the file specified.

Type: System.IO.FileNotFoundException
Source: Fiddler
at Fiddler.FiddlerApplication._SetXceedLicenseKeys()

at Fiddler.frmViewer.RunMain(String[] arrArgs)

at Fiddler.frmViewer.Main(String[] arrArgs)

Fiddler v2.4.9.4 (x64 AMD64) [.NET 2.0.50727.8009 on Microsoft Windows NT 6.3.9600.0]
Problem by Yakov Tchenak Status: New Comments: 1 Last update: 2015-04-21T02:51:40 by Eric Lawrence
Brian Schmitt

Support High DPI screens

Please support High DPI - When running in a Fusion VM on a Retina MAC, the UI tends to look a little squished. For example I run at 200% dpi.

Note: If it's winforms, you *might* be able to simply update the Form property AutoScaleMode = Font and then open the Designer.cs file and add "this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);"
Feature Request by Brian Schmitt Status: New Comments: 1 Last update: 2015-03-31T14:27:01 by Brian Schmitt
Jeff Sani

The session icon legend is incomplete in the documentation

There are several icons in the UI such as <> that have no reference in the online documentation. Some of the icons in the legend also appear to be slightly different. Can you please ensure that all of these are consistent and up to date?
Feedback by Jeff Sani Status: New Comments: 0 Last update: 2015-02-25T16:47:46 by Jeff Sani
Silvio Jeschofnik

Implement proper handling for content-type applicationzip


at the Moment when exporting a FiddlerWebtest using FiddlerCore, RequestsBodies with Content-Type application/zip will be handled as StringContent (Unicode-Encoded and therefore destroyed). I think best would be to check if Content-Type starts with "application/" in order to handle it as binary.

Kind Regards
Problem by Silvio Jeschofnik Status: New Comments: 0 Last update: 2015-02-13T11:26:17 by Silvio Jeschofnik
Stephen Wick

AutoResponder Action Supports Matching Groups

When defining a Rule within the AutoResponder tab, is it possible to use matching groups from the Match form field within the Action field?

For example: If I want to respond to a request for with content from I would create a rule like the following. This rule would also apply to any other page under

Match: regex:http://maint\.mysite\.com/(.+)

Please forgive me if this is already possible. Just let me know how to do it.


I Love this product.
Idea by Stephen Wick Status: New Comments: 1 Last update: 2015-01-20T17:39:28 by Eric Lawrence
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