Hello,

Sorry if this has already been solved, but a bit of Googling hasn't turned up anything that works.

I'm trying to inspect communications between a client application on my PC and a web server on my office network. Running Fiddler v5.0.20182.28034.

When I click Tools>Options>HTTPS>Decrypt HTTPS Traffic, I get this exception:

System.Security.Cryptography.CryptographicException: Access is denied.

   at System.Security.Cryptography.X509Certificates.X509Store.Open(OpenFlags flags)
   at .‰.†(String œ) in C:\JenkinsHome\jobs\FiddlerReleaseBuild\workspace\Fiddler2\Common\Core\DefaultCertProvider.cs:line 1147
   at .‰.‡(String œ, Boolean ˆ) in C:\JenkinsHome\jobs\FiddlerReleaseBuild\workspace\Fiddler2\Common\Core\DefaultCertProvider.cs:line 1260
 ...

There's more information, in the file attached.

If I click Actions>Reset All Certificates, I get a similar but different exception:

---------------------------
Awww, Fiddlesticks!
---------------------------
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.

Access is denied.

Type: System.Security.Cryptography.CryptographicException
Source: System
   at System.Security.Cryptography.X509Certificates.X509Store.Open(OpenFlags flags)
   at .‰.†(String œ) in C:\JenkinsHome\jobs\FiddlerReleaseBuild\workspace\Fiddler2\Common\Core\DefaultCertProvider.cs:line 1147
   at .‰.GetRootCertificate() in C:\JenkinsHome\jobs\FiddlerReleaseBuild\workspace\Fiddler2\Common\Core\DefaultCertProvider.cs:line 1013
   at .‡.‡() in C:\JenkinsHome\jobs\FiddlerReleaseBuild\workspace\Fiddler2\Options.cs:line 2503

Fiddler v5.0.20182.28034 (x64 AMD64) [.NET 4.0.30319.42000 on Microsoft Windows NT 6.3.9600.0] 

Happy to provide any more information if required.

Thanks!

Hi,

We do have a WPF application that send http request and web service calls to a server. We are also using TLS 1.2.

Everything is working find except when we run over a VPN connection. At one point, our web service call seems to be get stuck and the client do not get any response back from the server (and no timeout).

The VPN client software that is currently in used by the customer is Cisco AnyConnect version 3.x version.

Now when I run Fiddler 2, to investigate the issue , everything is working fine !

Why Fiddler would avoid our web service call to be stuck ? Is there a way I can run Fiddler in a mode that I could debug our problem ?

Any suggestion would be appreciated ...

Thanks

Why is the Discussions option under Help still going to Google Groups instead of here? Google Groups area hasn't been active for 3 years.

What about extension for VS Code?
I like Fiddler because i can do whatever i want, but script editor is almost notepad.exe level. Also i love VSCode because it is one of the comfortable editors. I will be very grateful if you will make extention for it to support fiddler script. 

Thanks.

I've been experiencing issues where Fiddler will slowly grow it's memory footprint over time from a reasonable amount to > 4GB and where I then need to kill it to free up memory.  It does not seem to matter if it is actually capturing data, how many sessions it has set to save or whether or not I'm even doing any browsing for it to capture.

I ran a test with it just prior to submitting this.  I opened it up and captured some data to the point where it had around 200Mb of memory usage according to Task Manager.  I then stopped capturing data, set Sessions Saved to 100, cleared all data in Fiddler (both via Ctrl + X and via the 'X' button in the toolbar) and then stopped browsing or doing anything on my PC.  I watched the memory climb from 200Mb to 1500Mb over the next minute or two at which point I closed it.

Is anyone else experiencing these issues?  I'm running Windows 8.1 Pro and have had similar issues on two different computers (home dev machine and my work PC).

Windows 8.1, Fiddler 4.5.0.0

We have our own https application based on WinINet (not a browser application). This has worked successfully with Fiddler until this week.

We now get the following error when connecting to the remote server:

fiddler.network.https> HTTPS handshake to testservices.bacs.co.uk failed. System.IO.IOException The handshake failed due to an unexpected packet format.

Other info from Fiddler:

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

Version: 3.3 (TLS/1.2)
Random: 55 39 05 98 AA 32 58 40 77 7C 78 67 B5 4C 56 5F B0 6F A3 8B D6 CD 60 EE AE 4E 2C 24 A0 15 8D A4
"Time": 27/10/2050 11:26:29
SessionID: empty
Extensions:
renegotiation_info 00
server_name testservices.bacs.co.uk
status_request OCSP - Implicit Responder
elliptic_curves secp256r1 [0x17], secp384r1 [0x18]
ec_point_formats uncompressed [0x0]
signature_algs sha256_rsa, sha384_rsa, sha1_rsa, sha256_ecdsa, sha384_ecdsa, sha1_ecdsa, sha1_dsa
SessionTicket empty
Ciphers:
[C028] TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384

[009F] TLS_DHE_RSA_WITH_AES_256_GCM_SHA384
[009E] TLS_DHE_RSA_WITH_AES_128_GCM_SHA256
[009D] TLS_RSA_WITH_AES_256_GCM_SHA384
[009C] TLS_RSA_WITH_AES_128_GCM_SHA256
[C02B] TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256
[C023] TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256
[C027] TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256
[C014] TLS1_CK_ECDHE_RSA_WITH_AES_256_CBC_SHA
[C013] TLS1_CK_ECDHE_RSA_WITH_AES_128_CBC_SHA
[003D] TLS_RSA_WITH_AES_256_CBC_SHA256
[003C] TLS_RSA_WITH_AES_128_CBC_SHA256
[0035] TLS_RSA_AES_256_SHA
[002F] TLS_RSA_AES_128_SHA
[C02C] TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384
[C024] TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384
[C00A] TLS1_CK_ECDHE_ECDSA_WITH_AES_256_CBC_SHA
[C009] TLS1_CK_ECDHE_ECDSA_WITH_AES_128_CBC_SHA
[006A] TLS_DHE_DSS_WITH_AES_256_CBC_SHA256
[0040] TLS_DHE_DSS_WITH_AES_128_CBC_SHA256
[0038] TLS_DHE_DSS_WITH_AES_256_SHA
[0032] TLS_DHE_DSS_WITH_AES_128_SHA
[000A] SSL_RSA_WITH_3DES_EDE_SHA
[0013] SSL_DHE_DSS_WITH_3DES_EDE_SHA
[0005] SSL_RSA_WITH_RC4_128_SHA
[0004] SSL_RSA_WITH_RC4_128_MD5

etc....

The SSL certificate was changed last week at the server end.

It was SHA1 (worked with Fiddler) and now is SHA#256 (get the error above).

Is this a configuration problem or something else?

Our application works OK when Fiddler not running.

 

Regards

Ian Patterson

pls hellp

I'm not a tech person, so I'm describing my question in a cumbersome way:

1. I'm using Fiddler to intercept particular HTTPS responses from an APP in my iPhone by using the filter function, those responses contain useful info to me.

2. In order to get those responses I need to swipe my iPhone for like 100 times, so I save all the 100 responses in a SAZ file so that I can replay it later, without swiping my iPhone again for 100 times.

3. But later when I click "Reissue Requests" after loading the SAZ file and selecting all the 100 old responses, the newly generated 100 responses contain data that is inconsistent with what I can see directly from my iPhone screen. I think the problem is that the newly issued requests don't update parameters like timestamp, cookie, etc.

 

Is there a way to automatically update all the parameters when I reissue the old requests stored in the SAZ file, so that the responses are up-to-date and consistent with the real-time data that I can see from the iPhone screen? Basically, I don't want to swipe my screen to manually issue 100 new requests to get the 100 desired responses, and I'm trying to hack a way to automate the data collection process with Fiddler.

 

 

 

Thank you.

Hi! I wasn't able to install Fiddler and I am trying to debug on it. So I wonder where can I find the Fiddlersetup.exe installation logs?

Or even better - Can I specify a directory in the command line such as: FiddlerSetup.exe /S /LOGS=D:\fiddler_tmp\log.txt?

at the first pic the error is shown 
and at the second one  when i tried to fix it