Questions on Fiddler Forum

0 answers

173 views

I am working with fiddler on C# But Need Help :(

My project: https://www.telerik.com/forums/attachments/1024176

On this project, for example, when I enter the yahoo.com site, I can change the response result of this site. However, when I want to change this page yahoo.com/fiddler_love and enter this page, I get 404 error result. 404 Error Response I cannot change the response value of the pages I receive. How can I change the response value of the pages that I get a 404 error, that is, nonexistent? For example, in the application I gave in the link above, I can change the response value of the yahoo.com page. Because such a page exists, but yahoo.com/fiddler_love this page's response does not change.

Because there is no such page. In summary, how can I change the response value of this page? 404 How does the response value change regardless? Thanks <3

Fiddler Classic

FiddlerCore

Windows

asked on 11 Jun 2021

0 answers

406 views

c# code running error

I am writing a dll file and need to extract json from the response information. When I use c# to write the following code, I run an error in fiddler, please help me. Thank you very much.

dynamic  data = JObject.Parse(source);
 string re = data.result;

runing result :

Fiddler has encountered an unexpected problem with an extension. Could not load the file or assembly "Newtonsoft.Json,Version=13.0.0.0, Culture=neutral,PublickeyToken=30ad4fe6b2a6aeed" or one of its dependencies. The system can not find the file specified.
Type:System.IO.FileNotFoundException
Source:sms

Windows

asked on 09 Jun 2021

1 answer

308 views

System.Net.Dns.GetHostAddresses

var ip = System.Net.Dns.GetHostAddresses("google.com")[0].ToString();

When the program is run through Fiddler. The above code returns the localhost IP.
I try setting breakpoints at BeforeRequest and BeforeResponse and AfterSessionComplete but no event is recorded?
May I ask is there a way to make it return the correct google.com IP?

FiddlerCore

Windows

answered on 08 Jun 2021

3 answers

5.5K+ views

HTTPS traffic decryption error: System.Security.Authentication.AuthenticationException

Hi,

Fiddler runs on PC whits Windows 7x64:

Fiddler Web Debugger (v4.4.9.0)

Built: 8 июля 2014 г.

64-bit AMD64, VM: 43,00mb, WS: 72,00mb

.NET 4.0.30319.17929 WinNT 6.1.7601 SP1

I'm trying to capture HTTS traffic from Android. Trusted certificate was installed, and I can see traffic from some sites, such as Google.

But on few site, such as Twitter, I get error:

CONNECT twitter.com:443 HTTP/1.1
Host: twitter.com
Connection: keep-alive
User-Agent: Mozilla/5.0 (Linux; Android 4.4.4; Nexus 5 Build/KTU84P) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/32.0.1700.99 Mobile Safari/537.36

A SSLv3-compatible ClientHello handshake was found. Fiddler extracted the parameters below.

Version: 3.3 (TLS/1.2)
Random: 54 D3 2B C1 BC 2C 00 09 2A 61 34 84 2A CD 1C CB 14 33 DD 7D 30 44 16 80 E4 94 FA AA CC 76 24 B6
SessionID: 79 46 00 00 36 D9 BA 70 AA 0E 97 A6 10 8B BA 99 95 BD E7 D2 08 4B 5D 93 80 09 14 55 F2 C2 4A 9F
Extensions:
   server_name   twitter.com
   ec_point_formats   uncompressed [0x0]
   elliptic_curves   secp521r1 [0x19], secp384r1 [0x18], secp256r1 [0x17]
   SessionTicket   empty
   signature_algorithms   00 20 06 01 06 02 06 03 05 01 05 02 05 03 04 01 04 02 04 03 03 01 03 02 03 03 02 01 02 02 02 03 01 01
   NextProtocolNegotiation   empty
   channel_id(GoogleDraft)   empty
Ciphers:
   [C014]   TLS1_CK_ECDHE_RSA_WITH_AES_256_CBC_SHA
   [C00A]   TLS1_CK_ECDHE_ECDSA_WITH_AES_256_CBC_SHA
   [0039]   TLS_DHE_RSA_WITH_AES_256_SHA
   [0038]   TLS_DHE_DSS_WITH_AES_256_SHA
   [0035]   TLS_RSA_AES_256_SHA
   [C012]   TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA
   [C008]   TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA
   [0016]   SSL_DHE_RSA_WITH_3DES_EDE_SHA
   [0013]   SSL_DHE_DSS_WITH_3DES_EDE_SHA
   [000A]   SSL_RSA_WITH_3DES_EDE_SHA
   [C02F]   TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256
   [C02B]   TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
   [C013]   TLS1_CK_ECDHE_RSA_WITH_AES_128_CBC_SHA
   [C009]   TLS1_CK_ECDHE_ECDSA_WITH_AES_128_CBC_SHA
   [00A2]   Unrecognized cipher - See http://www.iana.org/assignments/tls-parameters/
   [009E]   TLS_DHE_RSA_WITH_AES_128_GCM_SHA256
   [0033]   TLS_DHE_RSA_WITH_AES_128_SHA
   [0032]   TLS_DHE_DSS_WITH_AES_128_SHA
   [009C]   TLS_RSA_WITH_AES_128_GCM_SHA256
   [002F]   TLS_RSA_AES_128_SHA
   [C011]   TLS_ECDHE_RSA_WITH_RC4_128_SHA
   [C007]   TLS_ECDHE_ECDSA_WITH_RC4_128_SHA
   [0005]   SSL_RSA_WITH_RC4_128_SHA
   [0004]   SSL_RSA_WITH_RC4_128_MD5
   [00FF]   TLS_EMPTY_RENEGOTIATION_INFO_SCSV

Compression:
   [00]   NO_COMPRESSION

HTTP/1.1 200 Connection Established

FiddlerGateway: Direct

StartTime: 11:37:22.290

Connection: close

fiddler.network.https> HTTPS handshake to twitter.com failed. System.Security.Authentication.AuthenticationException A call to SSPI failed, see inner exception. < The message received was unexpected or badly formatted

On another PC it's OK on the same device. Thanks for any ideas.

Mobile

answered on 03 Jun 2021

1 answer

2.4K+ views

Fiddler Everywhere doesn't start on Windows 10

Hi,

I've installed Fiddler Everywhere(1.6.0) about 2 weeks ago on my Windows 10 machine and it worked fine. Since about a week, I can't start it, if I open the exe file, nothing happens.

I tried reinstalling it, I've installed even 1.6.1, but I experience the same symptom. Please find the latest entries from AppData\Roaming\Fiddler Everywhere\Logs\electron.log file:

[2021-06-01 15:10:07:470] [info] [Product information] Fiddler Everywhere 1.6.1
[2021-06-01 15:10:07:473] [info] [System information] win32 (Windows_NT/x64) - version 10.0.18363
[2021-06-01 15:10:07:514] [info] Initializing splash screen.
[2021-06-01 15:10:07:518] [info] Attempting to run server - 5 attempts left.
[2021-06-01 15:10:07:519] [info] Calculating the URL of ASP.NET Server application.
[2021-06-01 15:10:07:519] [info] Generating random port.
[2021-06-01 15:10:07:520] [info] Trying to start server at port [37538].
[2021-06-01 15:10:07:521] [info] Attempting to run server - 4 attempts left.
[2021-06-01 15:10:07:522] [info] Calculating the URL of ASP.NET Server application.
[2021-06-01 15:10:07:522] [info] Generating random port.
[2021-06-01 15:10:07:522] [info] Trying to start server at port [10761].
[2021-06-01 15:10:07:523] [info] Attempting to run server - 3 attempts left.
[2021-06-01 15:10:07:524] [info] Calculating the URL of ASP.NET Server application.
[2021-06-01 15:10:07:524] [info] Generating random port.
[2021-06-01 15:10:07:524] [info] Trying to start server at port [61944].
[2021-06-01 15:10:07:525] [info] Attempting to run server - 2 attempts left.
[2021-06-01 15:10:07:526] [info] Calculating the URL of ASP.NET Server application.
[2021-06-01 15:10:07:526] [info] Generating random port.
[2021-06-01 15:10:07:526] [info] Trying to start server at port [21829].
[2021-06-01 15:10:07:527] [info] Attempting to run server - 1 attempts left.
[2021-06-01 15:10:07:528] [info] Calculating the URL of ASP.NET Server application.
[2021-06-01 15:10:07:528] [info] Generating random port.
[2021-06-01 15:10:07:528] [info] Trying to start server at port [50452].
[2021-06-01 15:10:07:529] [error] Maximum number of attempts reached - quitting application.
[2021-06-01 15:10:07:530] [error] Unable to start the server, error is Maximum number of attempts reached - quitting application.

Could you please assist what might the issue? Fiddler Classic works fine without any issue.

Thank you.

Windows

answered on 02 Jun 2021

0 answers

3.9K+ views

The server (www.fiddler2.com) presented a certificate that did not validate, dute to RemoteCertificateChainErrors

Hi,
we've encountered error in subject of this post continued by:

"0 - A certificate chain could not be built to a trusted root authority.

ISSUER: CN=GlobalSign RSA OV SSL CA 2018, O=GlobalSign nv-sa, C=BE

This warning can be disabled by clicking Tools -> Options."

This seems to be problem with local certificate store on client computer? Not neccessarily Fiddler issue.
Using Windows 7.
How do we proceed?

Fiddler Classic

Windows

asked on 01 Jun 2021

13 answers

1.6K+ views

Traffic invisible in Fiddler but visible in Wireshark

I am trying to do some tests on a dotnet application. However some requests are present in wireshark but not in fiddler?

Windows

answered on 27 May 2021

0 answers

563 views

Fiddler League of legends question

Hello Filip again, so im playing around with fiddler on League of legends and i get this error when i change some of the value, is there any fix>?

and one more question, so this is the league of legends shop

and now i lost the 6300 Blue essence is there anyway to bug or glitch the shop so it doesn't take any blue essence?

From Filip

Fiddler Classic

asked on 20 May 2021

1 answer

534 views

FiddlerCore - Modern Authentication Microsoft Outlook

Hi,

Is there a way to handle Modern Authentication with fiddlercore?

Thanks,

FiddlerCore

Windows

answered on 20 May 2021

1 answer

2.0K+ views

CertMaker for iOS and Android not creating correct cert

Hi,

We are using Fiddler Classic with the CertMaker for iOS and Android extension. We made sure to "Reset All Certificates" through Fiddler and double checked if there were any leftover in the certificate stores (user and machine).

After installing the certificate created by CertMaker for iOS and Android, we are getting errors on mobile saying the certificate is invalid. We checked the certificate, and it has a lifetime of 10 year, while in Fiddler, it says it has a lifetime of 2 years.

Screenshots attached. Is there a regression in the CertMaker for iOS and Android?

Fiddler Classic

Mobile

answered on 20 May 2021