Last Updated: 24 Sep 2020 12:59 by ADMIN
Created by: san
Comments: 13
Type: Feature Request

I am trying to login to fiddler anywhere on Ubuntu.  But since the system is behind proxy, while logging into proxy, i get network error.

I have configured the proxy in env variables as well as network settings >proxy, but it does not work.

Please provide a way to configure the corporate proxy for fiddler everywhere before login


Last Updated: 16 Sep 2020 13:44 by ADMIN

Steps to reproduce:

  1. Post a 69k request to a web api (encoded JSON data) via browser.
  2. Inspect request data in Text and Raw fields.
  3. Observe that the data is truncated in the middle of a property name (not a null char).

Example data posted (snippet with middle section excerpted):


There is much more data that should occur after the property "immediatePatientSafety".  There does appear to possibly be additional fields presented in the Web Form inspector although some of the values are truncated and have an ellipsis (...) following those lines, so I believe that the tool is capturing the data but will not make it visible or available in the Text or Raw Inspectors.

No option exists to configure the amount of request data that is captured or to cause the Inspector to "show more" data.

I need to be able to see the full text request to troubleshoot an issue with the back-end application.

I need the data available in the Text or Raw inspector so that I can cut and paste it out for external processing and discussion with the developers.

I noted that a separate bug report has been issued for a missing "show more data" option on large response records.




Last Updated: 22 Aug 2020 02:10 by Tim

Fiddler for Windows allowed you to add custom columns to Web Sessions list. 

Fiddler Everywhere needs this option so I can add in a column to show the IP address of the server being connected to.

Can these methods be added into Fiddler Everywhere:

  1. https://docs.telerik.com/fiddler/knowledgebase/fiddlerscript/addcolumns
  2. https://docs.telerik.com/fiddler/Observe-Traffic/Tasks/ConfigureColumns 
Last Updated: 14 Aug 2020 09:21 by ADMIN

Latest version of Fiddler (v0.10.0) and Android Emulator is not proxying the connections properly.

I have Fiddler Everywhere running and know it is working when I can send requests through Postman and see them show up in Fiddler properly.

However, if I set up the Android Emulator through Android Studio, and set the proxy to be Fiddler, connections do not fully reach the backend service I am sending requests to. All that shows up in Fiddler is




HTTP/1.1 200 Connection Established
FiddlerGateway: Direct
StartTime: 16:12:05.141
Connection: close

The service is running on my local host machine ( on port 5000.

If I close Fiddler and run charles-proxy, then set the Android Emulator to use that as the proxy, I see the full request, my service responds, and I see the response in Charles.

Last Updated: 04 Aug 2020 12:40 by Sean

MacOs, Fiddler Everywhere 10, Cisco AnyConnect.

Here's the workflow...

In the morning, Cisco VPN isn't connected.  All traffic is blocked by design.  Attempt to start Fiddler Everywhere.  WON'T START because it can't login.  What is this new requirement to login?  If I don't start Fiddler before the VPN, no traffic ever logs.  If i don't start the VPN, Fiddler won't start.  A bit of a cartch-22, ya think?

Somehow I bypass the VPN (Don't tell corp security) and get logged-in.  Fiddler is up.  Start the VPN. Get some work done.  Shiny new UI!  Still can't drag-drop from inspector to composer?  Damn.

At some point the Fiddler login EXPIRES.  Why does it expire?  What do I even need a login for?  At this point ALL TRAFFIC fails, since Fiddler was the system proxy.  All work stops.  Now I need to stop Fiddler, Stop the VPN, attempt to start Fiddler again....oh wait, can't login because the VPN is down...  here we go again.

This is all a serious waste of time.  I can see registering Fiddler so you know who your users are.  What's with the REQUIREMENT to have a login, and why does it expire?  It kinda makes Fiddler useless.

Please remove the requirement to login to an account before being able to use Fiddler Everywhere.




Last Updated: 03 Aug 2020 13:20 by ADMIN
Scheduled for FiddlerCore Release

Hi there,

I've successfully setup fiddler-everywhere 0.4.0 and am able to sniff traffic to various websites on my linux (Ubuntu 18.04) laptop. However some https sites are not working - fiddler-everywhere severs the connection at the SSL handshake phase. These same sites work in the windows version of Fiddler (v 5.0.20192.25091 - built 04 June 2019) however.

What is the status of the SSL support in fiddler-everywhere vs windows Fiddler?

Example site that fails over https:

Example site that works over https:

Fiddler captures for absa.co.za


CONNECT www.absa.co.za:443 HTTP/1.1
Host: www.absa.co.za:443
Connection: keep-alive
User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.142 Safari/537.36

A SSLv3-compatible ClientHello handshake was found. Fiddler extracted the parameters below.

Version: 3.3 (TLS/1.2)
Random: 1F 0E B0 54 5D 66 42 82 C9 A8 A6 D5 8F C2 F0 C6 A8 16 0C 8E 14 45 F2 B4 B5 95 92 66 B6 53 D6 F4
"Time": 2015/01/09 19:21:35
SessionID: empty
	0x5a5a		empty
	server_name	www.absa.co.za
	extended_master_secret	empty
	renegotiation_info	00
	elliptic_curves	unknown [0xBABA), unknown [0x1D), secp256r1 [0x17], secp384r1 [0x18]
	ec_point_formats	uncompressed [0x0]
	SessionTicket	empty
	ALPN		h2, http/1.1
	status_request	OCSP - Implicit Responder
	signature_algs	sha256_ecdsa, Unknown[0x8]_Unknown[0x4], sha256_rsa, sha384_ecdsa, Unknown[0x8]_Unknown[0x5], sha384_rsa, Unknown[0x8]_Unknown[0x6], sha512_rsa, sha1_rsa
	SignedCertTimestamp (RFC6962)	empty
	0x001b		02 00 02
	0xeaea		00
	[5A5A]	Unrecognized cipher - See http://www.iana.org/assignments/tls-parameters/
	[002F]	TLS_RSA_AES_128_SHA
	[0035]	TLS_RSA_AES_256_SHA




HTTP/1.1 200 Connection Established
FiddlerGateway: Direct
StartTime: 10:28:40.706
Connection: close

fiddler.network.https> HTTPS handshake to www.absa.co.za (for #329) failed. System.IO.IOException Unable to read data from the transport connection: Connection reset by peer. < Connection reset by peer

Last Updated: 03 Aug 2020 07:20 by ADMIN

Colleagues, please add an essential feature of Fiddler Classic called Automatic breakpoints


I'm sure that a bunch of people will migrate to Fiddler Everywhere if you implement this



Last Updated: 15 Jul 2020 09:54 by ADMIN

With Fiddler on Windows an imported HAR file would load into a new window

Current Fiddler Everywhere appends the HAR file into the current window you have open. 

For example, I see my HAR import and it gets appended into the "Live Traffic" session. It should import into a new window like the existing windows version does.



Last Updated: 01 Jul 2020 09:05 by ADMIN

On Request Inspector Screen, Web Forms Tab, I'm unable to highlight or copy contents. Cmd + A also doesn't work to highlight contents. 
Last Updated: 01 Jul 2020 08:20 by ADMIN

On Request Inspector, Web Forms Tab, the header row seems duplicate. 

Last Updated: 01 Jul 2020 07:08 by ADMIN

While inspecting requests where Content-Length > 3000, only 3000 characters of the request body gets displayed in both Raw and Text views. When I copy the whole contents of the selectable area (CMD + A, CMD + C) and paste it into a text editor, it seems like there is a 'View full request...' text somewhere which does not show up. I remember this button from previous versions. 

OS : macOS Mojave Version 10.14.6

A sample HTML with dummy form to reproduce the bug and recorded session is attached. 

Last Updated: 16 Jun 2020 10:55 by ADMIN

I'm unable to connect to "gateway.icloud.com" when Fiddler is open and decrypting HTTPS traffic.

This is Fiddler Everywhere 0.10.0 on macOS 10.15.5.

To reproduce:

Open Fiddler and make sure it's decrypting HTTPS traffic.

Open any browser and go to https://gateway.icloud.com/

Expected result: Page loads (it's blank. This is normal.)

What actually happens: fiddler.network.https> HTTPS handshake to gateway.icloud.com (for #820) failed. System.Security.Authentication.AuthenticationException The remote certificate is invalid according to the validation procedure.


Same thing happens on https://configuration.apple.com/

Last Updated: 10 Jun 2020 06:25 by ADMIN
I love the FiddlerScript feature. Will Fiddler Everywhere have this feature? Or maybe command-line feature?
Last Updated: 02 Jun 2020 06:26 by ADMIN
Created by: Ryan
Comments: 9
Type: Bug Report

I fire up Fiddler Everywhere on my Mac. Generally, it appears to do nothing.

In further detail, "Stream" and "Decode" can be toggled, but otherwise do nothing. The connections icon has a hover-over describing my host and states I have a network connection. The help icon goes to the very limited documentation via browser. The settings icon pops open the settings dialog, which does appear to save changes, but not impact the "nothing" being done by the application. The capture button and inspectors button appear to do nothing. The main viewing area states "No records available." The area to the right of the main area states "Please, select a single Web Session to inspect." And that is it.

Either I'm doing (or not doing) something dumb, or it just isn't working for me. Any help would be appreciated :)

Mac specs: High Sierra 10.13.6, 2.6GHz i7, 16 GB memory

Last Updated: 01 Jun 2020 14:31 by ADMIN
Created by: Leonardo
Comments: 1
Type: Bug Report

Simple as that: fiddler everywhere does not capture traffic to localhost, AND when you insert your local address, it captures your request only to return that "

[Fiddler] DNS Lookup for "www." failed. System.Net.Internals.SocketExceptionFactory+ExtendedSocketException Device not configured



MAC OSX, using safari.

Other address are captured as expected

Last Updated: 01 Jun 2020 13:57 by ADMIN
Created by: Leonardo
Comments: 1
Type: Feature Request

I'm not 100% sure if this is a bug or it's a feature (of lack thereof) but it goes like this:

On regular fiddler, a great thing to do is to simply copy a raw request to the raw composer, change a param and re-issue it... Fiddler everywhere does not allow that! I have to write headers on a tab and the body on another and yet, there's a "Raw" tab.

The Raw tab unfortunately is not editable (read-only)... I believe that it should be editable

Last Updated: 01 Jun 2020 06:31 by ADMIN
Created by: Jonathan
Comments: 1
Type: Feature Request
It would be nice if I could right click on a header from a capture and quick add to the capture filter instead of coping and pasting.
Last Updated: 21 May 2020 06:15 by ADMIN
Fiddler Everywhere   (How to set up my country's language, I saw PAK language pack file)
Last Updated: 13 May 2020 12:16 by ADMIN

Operating System: macOs Catalina 10.15.4

Step by step instructions on how to reproduce the problem:

  1. Connect to VPN (mine is Cisco AnyConnect).
  2. Open fiddler capture traffic.

You can also do the following to reproduce the problem:

  1. Open fiddler capture traffic.
  2. Connect to VPN (mine is Cisco AnyConnect).


Use case: I work remotely and connect to a VPN. In comparison, Charles Proxy can capture traffic when VPN is on. The comparison was to point out traffic is possible to be captured on VPN to counter any arguments.

Last Updated: 29 Apr 2020 16:24 by ADMIN

Having used the original Fiddles for almost a decade. The new one looks great, but the UI scaling is way too big and spacious for actual production work.

We may have hundreds of requests in one test case and it's important that we see as many requests as possible on one screen so that we can get the whole picture how a service works (for example when reverse engineering something that's badly documented).

With the new UI it's only possible to see few dozen requests, so some kind of UI scaling is required. Also the inspector windows use way too much vertical space. It's really hard to see what's happening in a large request/response.


In my opinion the usability and productivity are more important than how sleek or modern the UI looks. Please prioritize the usability of the UI. Until then, I will be enjoying the classic Fiddler :)


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