Hello, for some tests, I'd like to use Fiddler to route through the corporate proxy network and, in a specific case, process requests/responses directly with mitmproxy scripts (because Fiddler Everywhere doesn't yet offer the same functionality as FC).

So I connect Fiddler to mitmproxy by setting the gateway proxy to mitmproxy listening at localhost:9090.

But it seems that Fiddler doesn't respect this setting. It always routes through the internet normally.
Even if I intentionally configure the wrong proxy port, the connection persists.

What should I do? Maybe I got wrong something??

I'm using Fiddler in Linux and already added certificates of Fiddler and mitmproxy to the system (actually i'm using the same one).

fiddler-everywhere-5.21.0.AppImage runs successfully on a Fedora 37 workstation. On a Fedora 41 workstation it throws a System.TypeInitializationException and reports " Fiddler.WebUi is tampered" and fails to start the server.:

09:08:37.489 › Trying to start server at port [16197].
09:08:37.617 › Server error log during start: Unhandled exception. 
09:08:37.632 › Server error log during start: System.TypeInitializationException: The type initializer for '<Module>' threw an exception.
 ---> System.Exception: Fiddler.WebUi is tampered.
   at MaoFcf2Vq4taIANM6n.hIDAYxH6DWLHIthQgC.zSLipEDdx()
   at .cctor()
   --- End of inner exception stack trace ---

The checksum on the AppImage file is the same on both FC37 and FC41 workstations. It fails on a clean FC41 installation as well as on another system that was upgraded from FC38 to FC41. Full "script" log attached. Am I missing some preparation or is this a bug?

So I'm new to Fiddler, I'm using it on Linux via the AppImage download on Debian/Testing. I'm trying to use it to debug something on my Android phone. When I seelect `Capture and Inspect Traffic` -> `Remote Devices` -> `Android`, click Next, select my ethernet interface, I try and go (on my phone or another machine) to the IP & Port that it shows, but can't connect. When I check the host machine's opened ports, it shows it opened up on IPv6, not IPv4, even though it's showing the IPv4 local address. I can ping the host IPv4 address just fine, but doesn't look like Fiddler is opening up a port on it.

$ netstat -anp  | grep -i 8866
tcp6       0      0 :::8866                 :::*                    LISTEN      230864/Fiddler.WebU 

Hello

Yesterday I installed Fiddler, to test it.

I sniff https request to instagram.
(using the filter  CONTAINS   instagram)

Then I tried to do it for my python code, running in terminal window of Ubuntu, on windows wsl.
Nothing appears in the requests and response.

Today I thought to try again and I open the Fiddler, but it sniff NOTHING.
(Even if I clear the filter)

Any hints to those two issues ?

Thanks

Good day,

so im running the trial versions, and it seems like i have to configure every device i want to monitor individually?

cant i point my router to fiddler and through that see all my connected devices?

I'm evaluating Fiddler Everywhere, and trying troubleshoot a java application. 

Initially Fiddler shows a warning that it cant decrypt HTTPS, so I install the root certificate into Arch and trust it, set Fiddler to use system proxy, and then set up the application to point to Fiddlers proxy.

The warning in Fiddler then disappears, so it gives the impression I've done everything right

At this point it can show HTTPS connections (although they are shown as HTTP, and METHOD is always CONNECT, rather than the GET I was expecting to see).

It's also then able to show HTTP(S) headers, but never the actual decrypted response or request body

Any help appreciated thanks

When I close fiddler, I can access to outlook; while using fiddler, I fail to visit it with the error message below:

UTC Date: isn't important
Client Id: isn't important
Session Id: isn't important
Client Version: 20230310007.15
BootResult: cdnError
Failed resource: https://res-geo.cdn.office.net/owamail/20230310007.15/scripts/../resources/locale/zh-hans/owa.MailBoot.json
Back Filled Errors: Unhandled Rejection: Error: Failed to load localized strings:undefined|Unhandled Rejection: Error: Failed to load localized strings:undefined|undefined:undefined|undefined:undefined
err: Error: Failed to load localized strings
esrc: InitLoc
et: ClientError
estack: c@https://outlook.live.com/mail/0/?bO=2&sessionId=isn't important
a/a<@https://outlook.live.com/mail/0/?bO=2&sessionId=isn't important

I'm trying to use fiddler v4.4.8.4 in my ubuntu 14.04 virtual machine to capture https connections, and I get "secure connection failed". Of course, when I close fiddler or don't check cature https connects, firefox works well.

I've done operations below:

1. Export root certificate to desktop, update proxy settings in firefox, import and trust fiddler certificate in firefox.

2. In firefox about:config, set:

• security.tls.version.max=3
• security.ssl.enable_ocsp_stapling=false

3. I've used openssl to recreate a crt ver. certificate, added it into /usr/share/ca-certificates/mozilla, and reconfigured it.

Does anybody know how to solve this problem?

Android version 12 updated? OS was sent to compromised SD card... Core 4.1 not in Web settings? just showing under about phone? Apps use all permissions. Not updated compromised any help if possible with this device. No settings, just accessories. Please anything to block hacking open really need help until can use computer to root or buy new. Trial possible? No Bixby running, there? Knox there not running 20 apps running microphone,  Camera cannot stop anything.. since update from Samsung??? Afraid to use SD to update last OS... 

Hello.

On Windows it works perfectly fine for me. However on Linux fiddler everywhere seems to be unable to catch traffic from windows games running through proton. Is there any way to get that working?