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Mizanur
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Rank 2
 asked on 15 Sep 2018
0 answers
409 views

I'm trying to sniff traffic from local network 127.0.0.1:9000 but software always fail to connect. Without fiddler running, it works again. How can i fix it?

Missing User
 asked on 15 Sep 2018
0 answers
220 views
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
Carl
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Rank 1
 asked on 15 Sep 2018
0 answers
361 views

I'm writing a PC application that communicates with an Http server. This server implementation is buggy and generates mal-formatted responses. It is something I have to deal with.
I'm trying to use Fiddler to see the content of the response, and to adapt my code in consequence. But when Fiddler detects a protocol violation, it makes changes to the response.

Here is a log from fiddler:

11:39:10:1884 Fiddler.Network.ProtocolViolation - [#1] Response does not start with HTTP. Data:
 
200 OK

And the corresponding response header generated by Fiddler:

HTTP/1.1 500 Fiddler - Bad Response
Date: Tue, 11 Sep 2018 09:39:10 GMT
Content-Type: text/html; charset=UTF-8
Connection: close
Cache-Control: no-cache, must-revalidate
Timestamp: 11:39:10.188

I cannot even see the original response, the only one visible in Fiddler in the 'Response' pane is the modified one.
I would like my application to receive the original (mal-formatted) response. Is there any way to configure Fiddler to forward the response exactly as it receives it?

Olivier
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Rank 1
 asked on 14 Sep 2018
0 answers
331 views
Hi,

The CustomRules.js file is located in the '~/Documents/Fiddler2/Scripts' folder, but I would like to change this. Is there a way to do this?

Thank you,

Alex
Alex
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Iron
Iron
 asked on 13 Sep 2018
0 answers
114 views
hi at all, can Fiddler decrypt packet that transmit client program windows that use certificate ?
Marco
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Rank 1
 asked on 13 Sep 2018
0 answers
824 views

VMware.exe + Proxifier = Hangs or Freezes (responsible for the internet connection is but vmnat.exe/service)

if i remove the vmware rule in proxifier there is no Hangs or Freezes from vmware but too no proxy.

There is no problem with the network setup from vmware.

previously i used proxycap+Fiddler and its works with the vmnat.exe/service)
but there is a winsock conflict between proxifier and proxycap now i removed
proxycap.

 

 

Frank
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Rank 1
 asked on 13 Sep 2018
4 answers
504 views

Fiddler only working on http request from my android mobile apps. Fiddler is best more then others software but main problem is that, i can't capture from facebook app. Also play store, instagram and youtube are not capturing. Already i tried using 6-7 android phone, but i was can't capturing.

Admin please try on fiddler using your android phone facebook app. Then you will understand and can solve it.

I am using Lava Iris, Version 7.0, also i tried using lower version on different mobile (but not working).

 

I am waiting for admin reply and solution. Advance Thanks.

Mizanur
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Rank 2
 answered on 13 Sep 2018
2 answers
2.8K+ views

I have installed Fiddler, and made changes in Tools - Fiddler Options - HTTPs - checked "Capture HTTPs Connects" and "Decrypt HTTPs Traffic".

While running the Fiddler, I am not able to access / open any websites in any browser IE / Chrome. Below is the error I am getting.

Certificate Error: Navigation Blocked

There is a problem with this website’s security certificate.
The security certificate presented by this website is not secure.
Security certificate problems may indicate an attempt to fool you or intercept any data you send to the server.

If I close the Fiddler, I am able to open all the websites in IE / Chrome. Could you tell me how to resolve this issue.

Thanks

Mizanur
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Rank 2
 answered on 11 Sep 2018
1 answer
136 views

The beginning of the problem:

 

For months my computer would take about five minutes for HTTPS connections to function. As a result, Skype could not connect during this time and any HTTPS web requests would be stuck in "Establishing Secure Connection" during this time. I finally fixed the issue by removing all the DO_NOT_TRUST_FiddlerRoot certificates that I found in the "Personal" store.

 

Since then, fiddler is unable to decrypt HTTPS requests properly. Instead, Chrome displays a Privacy Error. I have seen other people on this forum with this problem fix the issue by upgrading Fiddler, checking a dll, or trusting the root certificate. On these points:

My Fiddler Web Debugger is v5.0.20182.28034 for .NET 4.6.1 (Running ELEVATED)
I do not understand what DLL I should be looking for in order to ensure that I have the right certificate authority. I have the CertEnroll engine.
In Tools > Options > HTTPS > Action:

  • I have never noticed a change when I choose "Reset All Certificates".
  • "Trust Root Certificate" does not work, the log shoes an error message: "The RFC server is unavailable"
  • I am able to "Export Root Certificate to Desktop" and install these certificates in the "Personal" store, but not "Trusted Certificate authorities".

As far as I can see, the basic problem is a permissions issue:

  • I can't delete a FiddlerRoot certificate (a certificate that I do not believe is the current root) from Trusted Certificate Authorities. (error: RFC server)
  • I cannot install a new root into "Trusted Certificate authorities" (error: store is read only, or did not open properly)

Any ideas on what permissions specifically are neededfor these RFC server error messages to be fixed?

 

Appreciate your help.

Sterling
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Rank 1
 answered on 06 Sep 2018
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