Hi,

I've installed Fiddler v5.0.20204.45441 for .NET 4.6.1 on Windows Server 2016, however I'm unable to capture any traffic at all. LAN settings seem to be ok, Fiddler added a proxy server 127.0.0.1:8888, capturing all processes and there is no filter active.

Could the issue be related to Win 2016 server not being supported?

On my local machine (win 10) Fiddler works great. Anything else I can check? 

Thanks

Somebody posted in the forum about Fiddler and Postman, and the suggestion was to disable HTTPS.
https://www.telerik.com/forums/fiddler-blocks-postman

That's not really a good idea since your authentication data will be unencrypted.

But here's how to do it:

* Enable HTTPS decrypting in Fiddler:
Tools > Options > HTTPS
Enable "Decrypt HTTPS traffic"
Accept all warnings about installing Fiddler's root certificate.

* Export Fiddler's root certificate:
Start > Run; type "certlm.msc"
Go to Certificates - Local Computer > Trusted Root Certification Authorities > Certificates
Right click "DO_NOT_TRUST_FiddlerRoot" and select "All Tasks > Export..."
Select "Base-64 encoded X.509 (.CER)"
Save the file somewhere.

* Enable certificate in Postman:
File > Settings > Certificates
CA Certificates => On
Click "Select File"
Point to your saved certificate file.

Hi guys,

i installed fiddler, rooted my android and started debugging.

Fiddler captues the traffic from chrome and some other apps. Nice!

Then i started whatsapp but there was no connection in fiddler.
I send a message, my other phone got it but still no message in fiddler.
Then i clicked on the profile picture and there was only a "CONNECT pps.whatsapp.net:443 HTTP/1.1" in fiddler.

Why i fiddler not showing the traffic?
I there is cert pinnig or something like that, whatsapp should not work but its working.

Hello,

I am new with Fiddler.  Please bear with my inexperience. :-)

My result panel is polluted with a Chrome extension 500 error. The URL is http://127.0.0.1:55296/ChromeExt/pabeoippfoppjkpbmbpjjjglbldlajfg.  Please find a screenshot attached.

Could you please tell me what my filter options would be?

I have tried:

* Filter rule: Request header > Hide if URL contains: "/ChromeExt/pabeoippfoppjkpbmbpjjjglbldlajfg"

* Script rule:

if ( oSession.url.Contains("/ChromeExt/pabeoippfoppjkpbmbpjjjglbldlajfg") ) 
        {   
            oSession["ui-hide"] = "yup"; // "The "yup" value is unimportant"
        }

What am I missing?

Thanks in advance for your help

Hello, first time poster. 

I work for a mobile games company, and in my previous job we used Fiddler and custom rules for creating quite extensive QA debugging tools. 

However, the company I now work for severely underutilized 3rd party tooling in their processes so i'd like to work on writing custom rules in Fiddler for my team to use. 

Here's the kicker- While I understand the fundamentals of how Fiddler and web debugging works I have no prior knowledge of writing code languages in any context. 

I'm hoping someone here will be able to provide advice on where I should start in order to understand how I can achieve what I want. 

Thank you!

Hello,

I installed some java application (search "eTrader instalacja") but I can't get web traffic with Fiddler. Is is possible with Fiddler?

Hi!

I'm new to Fiddler, I had some success, but there is also an unsolved problem. My setup is:
- An appliance with an integrated webserver. (This appliance is accessible via HTTP only)
- A PC with Fiddler (used as a reverse proxy)
- Another PC with a Browser
All 3 components are in the same network.

I want to use Fiddler for 2 tasks:
- First task is to edit the webpage of the appliance on the fly, I need to remove some content. This works fine, I managed to edit the page with FiddlerScrip. On the PC with the browser I can see the changed webpage.
- Second task: For later use there is a requirement, that this changed webpage is accessible via HTTPS. I tried a lot of settings in Fiddler, but without success. I can't even see any reaction in Fiddlers Session window when I try to access the changed webpage via HTTPS. I assume that the ports are correct, because it works with HTML. Is there a way to solve this problem?

regards
Gerhard

I've been using Fiddler for years, not really messed with the settings, it's just worked.

At the moment I cannot get it to show any local traffic, developing locally in VS2019 and using Chrome. I have no filters on. Is there any setting I should be looking at?

After updating v5.0.20204.45441, the connection from the phone via HTTPS was lost
Regenerating and reinstalling the certificate doesn't help.
Problem on both Android and iOS

I updated my Fiddler Web Debugger today 11/4/2020 and I am no longer able to open existing Fiddler captures (*/.saz files). When I double click on them nothing opens up in Fiddler. 

How can I downgrade my Fiddler to an older version?