When I try to runt he Fiddler installer I get an error.

After agreeing to the EULA and specifying an install folder I get an error that says:

"A Progress Telerik Fiddler component appears to be running. Please, close all Progress Fiddler-related applications and try again."

I am not currently running Fiddler. I don't know how to look for what is considered "related."

--Jacob

Hi Eric,
I was a newbie to FiddlerCore.I want to capture https traffic when requested to website using Selenium and FiddlerCore in .net.Coded as below 

CODE:

CONFIG.bCaptureCONNECT = true;
 CONFIG.IgnoreServerCertErrors = true;
var cert = InstallCertificate();// getting true
FiddlerCoreStartupFlags flags = FiddlerCoreStartupFlags.DecryptSSL & FiddlerCoreStartupFlags.AllowRemoteClients & FiddlerCoreStartupFlags.CaptureFTP & FiddlerCoreStartupFlags.ChainToUpstreamGateway & FiddlerCoreStartupFlags.MonitorAllConnections & FiddlerCoreStartupFlags.CaptureLocalhostTraffic;
FiddlerApplication.Startup(desiredPort, flags);
FiddlerApplication.BeforeRequest += RequestDetails;

private static void RequestDetails(Session oSession)
        {
            Console.WriteLine("Request URL {0}", oSession.fullUrl);// getting only http traffic details
            
        }

public static bool InstallCertificate()
        {
           
            if (!CertMaker.rootCertExists())
            {
                if (!CertMaker.createRootCert())
                    return false;

                if (!CertMaker.trustRootCert())
                    return false;
            }

            return true;
        }

Could you suggest me the way to capture https traffic


Thank you

Regards,
Avinash

     HI,

CONNECT mhms11.airtel.tv:443 HTTP/1.1 I see the tunnel to this address

Fiddler's HTTPS Decryption feature is enabled, but this specific tunnel was configured not to be decrypted. Settings can be found inside Tools > Options > HTTPS.
A SSLv3-compatible ServerHello handshake was found. Fiddler extracted the parameters below.
But no data after that.

Put this in fiddler   <client>;ssl2;ssl3;tls1.0;tls1.1;tls1.2 and installed certificates. This is happening for most android app. I am creating a hotspot in windows and connecting android tab. I installed. the root certificate on android. Any help to check if its certificate pinning rather than guessing which is creating this issue

I am trying to login into my application through Jmeter but when trying to get the response, fiddler displayed "Content -Type: multipart/from-data is not yet fully supported."

Hello, I'm having an issue where Fiddler and FiddlerCore are missing specific HTTP traffic.

I'm using both to determine where video players keep their video files by tracing the HTTP requests and issue takedowns on those locations. Problem is starting from at least last week, I am not seeing the requests/responses for these video files from a single website that I was once able to see in Fiddler or using FiddlerCore in my C# applications. I am seeing all other HTTP traffic, I have no filters on, and the missing requests are not HTTPS.

An example URL is: http://megashare.im/watch-bhaag-milkha-bhaag-2013-online-free-megashare.html

The video player on this page will make a HTTP request once clicked:


Both Fiddler and FiddlerCore do not capture this request or its response. I was able to get the missing request by using WireShark:


I have noticed that when navigating to the example URL the Fiddler GUI logs many errors in this format:


And FiddlerCore is also returning errors when I'm attempting to parse the Sessions when navigating to the example URL using Selenium in my C# application:


I'm not exactly sure why Fiddler isn't able to fully capture these video source URLs, but any help would be appreciated.

Thanks,
Anthony

Same IOS app, exactly same operation；  request a new task .

 

When I connect the phone to the fiddler run on a window XP PC, got a code say:  it generate the task locally, server response confirm message, then the app got the task.

 

When I connect the phone to the fiddler run on a windows 10 PC, got a code say:  send a request to server, server response and  generate the task, then the app got the task.

 

How could this happen? Is this a bug? The actually code should be  server generate the task.

Hi

I need to run on my computer (win7/win10) an IE session with a different account (start IE with Run As and authenticate). Is it possible to capture the traffic from that IE session with Fiddler? Running Fiddler with the other account does not work, it does not capture anything (I remember his was working a long time ago...)

If some configuration is needed in IE to make this work, can this be done "automatically" (meaning that it would not disrupt the way the browser works when Fiddler is not capturing)?

Hello,

I'm using Fiddler to intercept Java HTTPS traffic. This was accomplished by using the Fiddler Root certificate to create a keystore file which is read by the JVM.

It works fine in Fiddler GUI, but in a FiddlerCore application, the connections are not going through.

I am just wondering if I need to set the cert in FiddlerCore, or something similar to get this to work.

Hello,

I'm using Fiddler in order to check server response time on an app we develop. (ios and android)

IOS worked fine, but on Android we had some problems.

http://docs.telerik.com/fiddler/Configure-Fiddler/Tasks/ConfigureForAndroid

I completed this guide, and i could capture all the traffic from mobile web. When we tried to enter any mobile android app the app pages did not load. (stuck on the loading screen...)

Happened in various android devices and apps.

Thanks,

Yoav

I configured fiddler to redirect all https traffic destined to oldURL.com to newURL.com, using the below fiddlerscript sample from the Telerik Fiddler documentation.

This has been working fine for several months. Today I attempted to execute the same monthly process, but this time it failed.
After some investigation I noticed that fiddler is returning a certificate with the wrong CN
A quick test in Chrome shows that when browsing to https://oldURL.com, fiddler returns a certificate with a subject of CN=newURL.com

This causes the handshake to fail with my application, and the montly process to abort.

I can only assume that this issue crept in when I updated Fiddler last month to: v5.0.20181.14850 for .NET 4.6.1

I have now worked around this by also adding oSession["X-OverrideCertCN"] = "oldURL.com";

What is the correct way to redirect HTTPS request & Tunnel, whilst still providing a correctly named certificate to the client application?

 

https://docs.telerik.com/fiddler/KnowledgeBase/FiddlerScript/ModifyRequestOrResponse