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1 answer
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Why does the POST request custom reply file not work?

GET asks him to be able to reply normally with a local file!

Nick Iliev
Telerik team
 answered on 25 Nov 2024
1 answer
98 views

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?

Nick Iliev
Telerik team
 answered on 25 Nov 2024
1 answer
54 views

Hello,

Pretty new to Fiddler, I'm using Fiddler Everywhere 5.21.0 .

What I'm trying to achieve is to replace the status code of a call to an identity server with 401, but just once.

I've created a following rule

Conditions:

When any of these conditions are met specific number of times: 1

URL Contains [Identity Server]/connect/token

 

Actions:

Update status code: 401

 

However, live traffic shows that when a /connect/token request is sent out, its status code is 200.

Only when I increase

When any of these conditions are met specific number of times: 2

A /connect/token request (a singular one, based on the Live Traffic view) will have its status code replaced to 401.

Why is that the case? Does the Live View actually filter out some traffic?

 

Thanks for bearing with my silly questions.

Zhivko
Telerik team
 answered on 21 Nov 2024
1 answer
88 views

How is possible select a target (e.g. an opened application) ?

I mean that in the classic fiddler is possible to drag the "target" icon over any app or browser, which you like to inspect

 

Thank you

Nick Iliev
Telerik team
 answered on 17 Nov 2024
1 answer
583 views

Hi, i get this error on any site any browser, 

when i looked at the certificate list, i see that the certificate is expired:

 

i just reinstalled the last version, but the problem persists

is there any way to fix that ?

Nick Iliev
Telerik team
 answered on 11 Nov 2024
1 answer
75 views

Hello,

I recently installed Fiddler, and I must say it is super easy to use and works perfectly in almost every example.

However, I encountered one special error: I am trying to track traffic on my Mac (Mac OS Sonoma 14.6.1.) for the Apple TV app (1.4.6.32).

When I try to launch Fiddler first and then the Apple TV app later, Apple TV won't start properly, and only my collection is visible. I am not able to see or visit the store or even the Apple TV+ subscription offer.

When I switch the order, so Apple TV is launched first and Fiddler afterward, it works, but there are some hiccups, like images not properly downloading. And, of course, the initial traffic when Apple TV is launching, which is crucial to me, is not visible anymore, and I can not force the app to reload the Apple TV storefront.

Is there a problem with the certificates or any other settings?

I also noticed during the very first launch and some digging in Settings that basically every major Apple domain (apple.com, mzstatic.com) was blacklisted, which was the reason why it was not working at the beginning entirely. After the removal of the Apple domains from the blacklist, Apple traffic is captured, but only if I use the order mentioned above (Apple TV first, Fiddler later).

I appreciate your help

T.

Nick Iliev
Telerik team
 answered on 06 Nov 2024
1 answer
59 views
Hello, my computer is Windows 11 operating system.  I can easily monitor traffic on my ios phone with fiddler classic. But I downloaded fiddler everywhere. I enter the program and activate allow remote device to connect to monitor traffic according to the instructions. I write http://ip address:8866 on my iOS phone, but I can't connect. Allow remote device to connect is disabled when you log out of Fiddler everywhere and log back in. I activate and save. Closing and reopening the program disables it again.  How can I solve the problem? I think the problem is with the computer. The computer and phone are connected to the same network. I can use it comfortably with Fiddler classic. The problem is only with fiddler everywhere.  allow remote device to connect does not keep active. As a result, the phone cannot be connected. Please support.
Nick Iliev
Telerik team
 answered on 29 Oct 2024
1 answer
93 views

hi
I'm use fiddler "everywhere enterprise"
I'm having trouble with proxy connection after setting up VPN on Android.

[Pre-Condition]
 - PC: Mac OS / WindowOS
 - VPN App: Global Protect
 - Device setup: CA installed in PC / Android ddvice (No VPN setup) / Set the device to the same proxy information as the PC

[Check]
 - iOS
     > set up VPN > Proxy connection is successful and traiffc checked               << Pass
     > Proxy connection is successful and traiffc checked > can set up VPN        << Pass 

 - AOS
     > No VPN setup > Proxy connection is successful                                            << Pass
     > setup VPN > Proxy connection is successful but cannot traiffc check        << Fail
     > Proxy connection is successful and traiffc checked > cannot setup VPN   << Fail
          - VPN app Fail comment:  could not verify the server cerificate of the gateway / if the issue persists, contact your administrator



Please help
thank you!

Nick Iliev
Telerik team
 answered on 23 Oct 2024
2 answers
2.4K+ views

I have a certain iOS app that's not publicly available so you won't be able to fully troubleshoot, however I can explain the behavior I'm experiencing. 

When I attempt to use the app when  'Decrypt HTTPS Traffic' is disabled, the app works, but the data is encrypted and Fiddler prompts me to configure the settings.

When I enable 'Decrypt HTTPS Traffic' the app does not let me do anything and simply says 'network unavailable.' 

I did install the iOS certificate. I tested on several other apps and don't appear to be experiencing the same problem. Any ideas on how I can further troubleshoot this?

 

Thank you.

 

 

 

Oleksandr
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Iron
 answered on 22 Oct 2024
2 answers
49 views

I tried loading a page in the Fiddler Browser, there is about 21 cookies

 

When I use the inspector, and filter by cookie, I find only creation of 4 or so cookies.

I am trying to find the JS creating the rest

Nick Iliev
Telerik team
 answered on 22 Oct 2024
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