An program I want to capture HTTPS traffic from uses Mozilla's pem file with SSL certificates that should be trusted, I want fiddler to mimic one of these certificates so I can go through the SSL pinning. I don't know how and if this is possible so if anyone can help I'd appreciate it!

copied from my stackoverflow  post.

Hi,

I'm trying to run fiddler while installing an application from Windows Store. It was working today but I don't know what happened.

The problem is, Fiddler shows yellow bar saying "The system proxy was changed..." When I click on it, it uses a proxy server for my LAN.

Using a proxy server for my LAN, disables windows store from running.

When I go to Internet Explorer > Options > Connections > Lan Settings > Uncheck Use a proxy server

Windows store will run, but Fiddler will show the yellow bar again and if I click on it, it will reenable using proxy server.

 

HELP PLEASE

Hello, dear Telerik team and pro customers!

I signed up at trial version of Kendo UI. And installed it.
But can't find out without your step-by-step help provided, how it could help to passthrough ASP.Net and Fiddler Web Debugger restrictions to upload files larger than 2GB?

Which one tool should I start, find there same options as Composer tool at Fiddler Web Debugger and try to upload content I need?

Thanks in advacne,

I have fiddler v5.0.20173.50948 

I was recently migrated at work to Outlook 2016 (version 16.0.9001.2080) and an Office 365 mailbox.

When fiddler is active and capturing traffic, I will periodically (approximately every half hour or so) have Outlook attempt authentication, only to pop a dialog that says

    "You'll need the internet for this"

with an error code of 0xCAA70004

 

and outlook will no longer function, unless I turn off fiddler capture & restart Outlook.

 

I am capturing and decrypting HTTPS traffic, but only for the hosts related to my work as a developer. I tried to relax filters to see all HTTPS traffic and I don't see where fiddler is getting in the way of Outlook.

 

I have tried disabling IPv6 (tools / options / general), and the steps on http://toenailclippings.idealworld.net/2016/10/we-are-unable-to-connect-right-now/

 

Neither have worked. Thanks for the help.

So I just installed fiddler on my PC and I'm not able to capture any traffic. I had it installed some time ago and it was working just fine. What I've tried:

-If I click help-> troubleshoot, these 4 requests will be added to fiddler : http://prntscr.com/kn56hh . But It still doesnt capture anything if I acces a website

-If I navigate to  http://ipv4.fiddler:8888/, fiddler doesnt show any new capture (also the website returns the error "this site cant be reached")

-If I navigate to http://localhost:8888/, fiddler is able to capture the request http://prntscr.com/kn57g2

-My proxy settings are ok (they are set to 127.0.0.1:8888    http://prntscr.com/kn57v5)

-I'm using chrome to do all these tests. I've tried other browsers and they dont work either

-I have Decrypt HTTPS traffic enabled. I also tried pressing actions -> trust root certificate

Hi,

 

I've set everything up as per the Telerik guides but Fiddler is still not decrypting the traffic on any of the browsers I tested: IE, Firefox, Chrome.

 

Here is what I have done:

 

- Launched Fiddler as admin

- Added Fiddler root cert to Windows Cert store and Firefox's own managed cert store

- Activated the HTTPS decryption in the Fiddler options

- Verified that browser proxy is configured to localhost:8888

 

I'm running Fiddler on Windows Server 2012 R2

 

Thanks

 

 

Starting yesterday, Fiddler has begun automatically closing when I attempt to save "All Sessions" - it then reopens, with none of the sessions previously captured. I attempted to close and reopen, and then attempted a clean install. I'm continuing to have these issues. Anyone else have ideas about what might be doing this?

I have been looking online for multiple hours now and none of the other forum threads have worked. When I have fiddler open with https decryption enabled, and the certificate trusted, it makes my internet stop working and does not decrypt anything. I have resetted the certificate and tried to uninstall, but fiddler does not show up in the installed program list. How do I uninstall fiddler or get my https decryption working?

Hello

Thank you for making this awesome piece of software. I have used it many times before, and this is the first time where I actually can't get Fiddler to record any HTTPS traffic from league of legends.

 

What i want: Record all HTTPS requests that are getting sent by League of legends to their servers, using the League of Legends client. (The client is the only place where you can actually see the information that i need).

What does not work: I am quite sure that League of Legends does NOT use windows default proxy, and therefore does not get picked up by Fiddler. I am not quite sure if they use SSL-Pinning, I dont think they do - but i might be wrong. Each time I try to boot up League of legends I just see the HTTP tunnel without any HTTPS requests in between.

 

What i have tried:

- Tried forcing League of legends to use the proxy 127.0.0.1:8888 for it to go through fiddler. This is where I see only HTTP tunnels with instant connection closed. It also gave me the warning "Do you want to trust this certificate bla bla bla."

- Tried using ProxyCap and Your freedom to make rules to route all the data through fiddler using 127.0.0.1:8888.

- Tried to add an environment variable to my system settings called "all_proxy" with the value of 127.0.0.1:8888 to again make it go through fiddler.

 

I have attached two images, one showing my HTTP tunnels and one showing that I can receive HTTPS requests from other apps such as ShareX in this example.

Still no luck... What should I do in order to actually see the HTTPS Requests between the HTTP Tunnels? Thanks.

I'm just a game analyzer as my hobby. I check any Android games to see how it works and if game collect data or not

There is a problem with Fiddler 2 that i don't understand. It does not capture traffics from some games like it goes through Fiddler without Fiddler2 is seeing. No certificate, no any errors. game works fine without captured traffic

I have ensure that I have enabled proxy on Android system, have certificate installed, and check if https decryption is working. All fine. I have reseted cert and fiddler 2 but it doesn't help

All i got is traffic from ads.

Fiddler 2 does work with most of other online games. I just can't find out why Fiddler2 can't capture traffic of some game.

Can you please help me with this problem?

 

Here is screenshot of google.com https decryption: https://imgur.com/e9HtX5M

Here is screenshot of game that does not work with fiddler 2 but with just traffics from ads: https://imgur.com/YKghx9v

Here is screenshot of game with captured traffics https://imgur.com/8e1k4UL