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

Is it possible to add an event handler to react to when sessions are imported? I'd like the Fiddler extension I'm developing be able to react to imported sessions the same way it does for loading a Saz file.

Hi,

I'm currently evaluating your product.

We have a complex WebApi with which I've written a replacement for.  We don't currently have automated tests and they are expensive to develop due to the size of the API and our data.  I was hoping to use Fiddler as a web proxy to record requests manually initiated from use of the app against the live WebApi *version* such that we can then replay the requests and validate results against the new version that we are testing.  Effectively I'm trying to make cheap automated testing.  This would be our main use for this product.

I tried following this guide which indicates that this is possible with *Fiddler Everywhere*...
How to: Test Your API with Fiddler (telerik.com)

The document is possibly stale because I cant find this APITest tab on Fiddler Everywhere?

I did have some success against "Fiddler Classic" although I'm not sure this is entirely fit for purpose.
Our validation rules will require comparing JSON fields which are not necessarily in the same case or order.  The validators for Fiddler Classic in this context are not sufficient for this behaviour.

How do I achieve this please?  

Thanks.

The android emulator I used was yeshen

Operating system: android 7


fiddler version:5



I always: tunnel to

I searched many ways, but nothing worked out.

Is there anything I can do?

Hi everyone, 

Fiddler classic was working smoothly in the Memu play emulator application, but then the emulator crashed. I updated it. Now, the android certificate is in the system section, but  Google is giving error that certifica is not trust, it was giving errors, and I was monitoring the https traffic of applications such as Telegram, Twitter, Clubhouse without any problems. While I can download on my own PC and Android, I can't right now. error. However, after closing fiddler, I start the download and open it again, the download continues. I deleted and reinstalled Memu 2 or 3 times and tried again, it still gives the same error. What do you think is the reason? Also, I haven't tried any other 2 or 3 emulators. I get the same error on them too. I have been using it for 1 month without any problems. I'd appreciate it if you could help. Thanks in advance

Hi

I am trying to decode https traffic with fiddler classic. I see error below in Log. I did reset all certificates, trust root cerficates with both MakeCert, CertEnroll engines. Please advice how to fix this issue. I used to decode https traffic with older version (before 2019) of fiddler which used to work without any error. Now i do not find the download link for older version of fiddler.

10:06:28:1870 HTTPSLint> Warning: ClientHello record was 1803 bytes long. Some servers have problems with ClientHello's greater than 255 bytes. https://github.com/ssllabs/research/wiki/Long-Handshake-Intolerance
10:06:28:2315 !SecureClientPipeDirect failed: System.Security.Authentication.AuthenticationException A call to SSPI failed, see inner exception. < An unknown error occurred while processing the certificate for pipe (CN=www.telerik.com, O=DO_NOT_TRUST, OU=Created by http://www.fiddler2.com).

My Https settings are as below. I see the same issue with both MakeCert, CertEnroll engines.

Both Edge and chrome Browsers give error below when i nagivate to https://www.telerik.com/fiddler/fiddler-classic.