I'm using Fiddler to capture HTTPS traffic for a mobile game (emulated on Nox version 6.2.3.1). After you click past the title screen, the game takes you a loading screen, which downloads data from the internet. It always stops working once Fiddler captures the base URL for the game. An example of that error is shown in the first image. It seems to be working fine without Fiddler running.

It doesn't just effect Nox and the game, it also effects my web browser (Google Chrome). It always states that my "connection is not private" and prevents me from entering most websites with Fiddler on (some exceptions include this website and Discord), shown in the second image. When I exit out of Fiddler, it works perfectly fine again.

I believe that the reason why Fiddler is acting this way is because I have "Decrypt HTTPS traffic" turned on. For Nox, I followed the instructions shown here to capture the HTTPS traffic for that game (including downloading the certificate). I need to have "Decrypt HTTPS traffic" turned on, otherwise it won't capture all the HTTPS traffic for the game. However, when that option is turned off, the game works fine, so is my web browser.

Is there anyway around this? I'd like to be able to capture HTTPS traffic normally without getting all these errors. Any help would be much appreciated.

Hi

I don't know what's wrong, when I apply a filter with wildcards it doesn't include any https requests, only those that go through http. What am I doing wrong?

 

/André

Fiddler is not displaying the traffic though page gets loaded fine on chrome. What could cause this issue as there are no filters.

I keep getting the error "HTTP Request specified an invalid port number" in Fiddler.

It looks like the problem is that Fiddler is appending a "1" to the front of my port number.

The address I am plugging into my web browser is http://ourlocalserver:14485/api/...

This works fine when Fiddler is not capturing traffic. As soon as I turn Fiddler on, it starts failing, and Fiddler logs the address as http://ourlocalserver:114485/api/...

Notice that the port is now 114485 instead of 14485.

How can I get Fiddler to stop modifying the port number so that my tests work correctly?

Very new to this technology, apologies if this is a basic question. I am trying to understand if I download Fiddler on my mobile phone (iPhone 6), if I can "sniff" wifi packets from laptops/other devices on the same wifi? 

I'm learning Fiddler .
I use Fiddler certificate inside browser web, but Can I install Fiddler Certificate inside every application for Windows ?
Help me !

I can monitor almost every packet that passes through my device, but only the ones from Apple such as "http://api.smoot.apple.com:443" "http://keyvalueservice.icloud.com:443" "http://api-glb-msp.smoot.apple.com:443" are all encrypted.

 

I followed all instruction and guides, trying to solve this problem.

Is the device required to be jailbroken to decrypt Apple traffics? Or is there a way to solve this?

Hi,

I am software engineer.
Regarding license, would you mind letting me know whether it is ok for me to use Fiddler for work or not?
I do not embed the fiddler to product.
I will only use to analyze web packet.

Thank you in advance.

Hi,

Is Fiddler web debugger is free for a commercial environment?

Thanks,

Best regards

Hi all,

I'm not sure if I understand the possibilities on how to use Fiddler. From what I can read (and can see from my monitoring results) it monitors all web browser traffic. But what if I want to monitor the behaviour of a setup.exe file (or install.com). I want to check if it downloads any files, and if so, what files and from what URL.

Can that be done? Many thanks in advance.