Questions on Fiddler Forum

3 answers

621 views

Fiddler checks for updates althogh administratively disabled by registry keys

Although I have disabled update checks by setting the following registry keys I found earlier, Fiddler seems still to check during startup and throws an exception:

[HKEY_CURRENT_USER\Software\Microsoft\Fiddler2]
"CheckForUpdates"="False"

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Fiddler2]
"BlockUpdateCheck"="True"

---------------------------
Awww, Fiddlesticks!
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Fiddler has encountered an unexpected problem. If you believe this is a bug in Fiddler, please copy this message by hitting CTRL+C, and submit a bug report at http://www.telerik.com/forums/fiddler.

VersionCheckFailed: Server Response Code = 502

Type: System.IO.InvalidDataException
Source: Fiddler
   at Fiddler.Updater.GetLatestVersion(Boolean includeBetaVersions, Boolean isEmergencyCall)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
   at System.Threading.ThreadPoolWorkQueue.Dispatch()

Fiddler v4.6.2.3 (x64 AMD64) [.NET 4.0.30319.34209 on Microsoft Windows NT 6.3.9600.0]
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OK
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Fiddler Classic

answered on 21 Apr 2016

0 answers

275 views

Windows 10 update process not running through fiddler

Hi,

i have installed the latest fiddler version on a Windows 10 PC. After that i have configured the ssl decryption, enable tls 1.1/ 1.2 and set the winhttp proxy settings. Traffic runs through fiddler but the Windowsupdate funktion runs only if i disable the proxy settings. I see that i getting many 408 Request.

Could some one help me?

CW O

Windows

asked on 20 Apr 2016

2 answers

520 views

Fiddler Not Capturing Any Traffic - Proxy Settings Required?

Hi All,

I have recently downloaded Fiddler version 4.6.2.2 to try and capture traffic to identify why some federated services do not seem to be working on our network.

I found that when trying to capture traffic, nothing showed up. Some initial investigation led me to this other post on the forum:

http://www.telerik.com/forums/fiddler-not-capturing-traffic

I can confirm that I am also potentially being blocked on the client due to proxy settings which are controlled by GPO. Our proxy service, is a cloud based solution called Websense, which I have administrator access to.

What I would like to know is what kind of exception or settings will I need to put in the proxy to allow Fiddler to collect traffic?

Cheers,

Gordon

Windows

answered on 19 Apr 2016

1 answer

195 views

Performance

Hi,

Just a quick question, does Fiddler impact performance on servers. To be a bit more precise, having serious issues on a setup using a 3 server NLB setup. Was wanting to run Fiddler on all 3 servers, would this have an impact on performance?

Thanks

Sam

Fiddler Classic

answered on 18 Apr 2016

0 answers

248 views

Fiddler as an HTTPS MITM Server

I have an intranet web app that runs over HTTPS and needs to access a third party web service that listens on localhost:8080. Problem is the web browsers are cancelling the AJAX call to the localhost web service as they deem it as "Mixed-Content". Can FiddlerCore be used to act as an HTTPS server that is hosting the web service at localhost:443 and forward the request to localhost:8080 and relay the response?

FiddlerCore

asked on 17 Apr 2016

2 answers

173 views

code snippet for disabling filters in fiddler core

By default, do fiddler core have filter settings?

Does Fiddler core have default filter settings on?

Could you please provide code snippet to off filter settings for fiddler core?

FiddlerCore

answered on 15 Apr 2016

2 answers

148 views

Incorrect ServerDoneResponse value when streaming is enabled

I am using Fiddler to analyze XHR calls an Angular web app makes. In one particular case, the HTTP request to the server completes in one second, and in response to the XHR.onload event the client code performs a long-running operation (that takes, say, 10 seconds). When streaming is not enabled, Fiddler correctly reports a ServerDoneResponse time as being one second after FiddlerBeginRequest. When streaming is enabled, however, ServerDoneResponse is 11 seconds after FiddlerBeginRequest, i.e., Fiddler is including the time the client takes in response to XHR.onload. Is this a bug in Fiddler, or is this somehow expected behavior? For what it's worth, Chrome's dev tools network tab seems to have the same problem, in that it includes the time taken in onload when reporting how long the request took. Interestingly enough, Chrome's timeline tab does not have this problem - it correctly reports how long the request took.

Fiddler Classic

answered on 15 Apr 2016

0 answers

176 views

FiddlerCore not capturing traffic from remote client. (My iOS phone)

Here's my application's code:

public partial class frmMain : Form

{

private KeyValuePair<string, string>[] EncodeKeys =

{

new KeyValuePair<string, string>("MfZyu1q9", "EmcshnQoDr20TZz1")

};

public frmMain()

{

InitializeComponent();

}

public static bool InstallCertificate()

{

if (!CertMaker.rootCertExists())

{

if (!CertMaker.createRootCert())

return false;

if (!CertMaker.trustRootCert())

return false;

}

return true;

}

private void frmMain_Load(object sender, EventArgs e)

{

if (!InstallCertificate())

MessageBox.Show("Failed to install certificate.");

try

{

FiddlerApplication.BeforeRequest += FiddlerApplication_BeforeRequest;

FiddlerApplication.BeforeResponse += FiddlerApplication_BeforeResponse;

//FiddlerApplication.AfterSessionComplete += FiddlerApplication_AfterSessionComplete;

FiddlerApplication.Startup(8888, true, true, true);

}

catch (Exception ex)

{

MessageBox.Show(ex.Message);

}

void FiddlerApplication_BeforeRequest(Session oSession)

{

if (oSession.RequestMethod == "CONNECT")

return;

oSession.bBufferResponse = true;

}

void FiddlerApplication_BeforeResponse(Session oSession)

{

if (oSession.RequestMethod == "CONNECT")

return;

try

{

//if (oSession.uriContains("action"))

//{

oSession.utilDecodeResponse();

Debug.Print(oSession.GetResponseBodyAsString());

//}

}

catch (Exception ex)

{

MessageBox.Show(ex.Message);

}

Now this all works on my home computer when I connect remotely, it captures traffic just fine. However, on my work computer which I am using right now it does not work.

This isn't a firewall issue, because when I open the Fiddler application, it captures the remote traffic just as it's supposed to within my program.

I set my iPhone to connect to the proxy, and whenever I go to load a page, it just doesn't load and gives me "Safari could not open the page because the server stopped responding."

Windows