Hi everyone, 

Fiddler classic was working smoothly in the Memu play emulator application, but then the emulator crashed. I updated it. Now, the android certificate is in the system section, but  Google is giving error that certifica is not trust, it was giving errors, and I was monitoring the https traffic of applications such as Telegram, Twitter, Clubhouse without any problems. While I can download on my own PC and Android, I can't right now. error. However, after closing fiddler, I start the download and open it again, the download continues. I deleted and reinstalled Memu 2 or 3 times and tried again, it still gives the same error. What do you think is the reason? Also, I haven't tried any other 2 or 3 emulators. I get the same error on them too. I have been using it for 1 month without any problems. I'd appreciate it if you could help. Thanks in advance

Hi

I am trying to decode https traffic with fiddler classic. I see error below in Log. I did reset all certificates, trust root cerficates with both MakeCert, CertEnroll engines. Please advice how to fix this issue. I used to decode https traffic with older version (before 2019) of fiddler which used to work without any error. Now i do not find the download link for older version of fiddler.

10:06:28:1870 HTTPSLint> Warning: ClientHello record was 1803 bytes long. Some servers have problems with ClientHello's greater than 255 bytes. https://github.com/ssllabs/research/wiki/Long-Handshake-Intolerance
10:06:28:2315 !SecureClientPipeDirect failed: System.Security.Authentication.AuthenticationException A call to SSPI failed, see inner exception. < An unknown error occurred while processing the certificate for pipe (CN=www.telerik.com, O=DO_NOT_TRUST, OU=Created by http://www.fiddler2.com).

My Https settings are as below. I see the same issue with both MakeCert, CertEnroll engines.

Both Edge and chrome Browsers give error below when i nagivate to https://www.telerik.com/fiddler/fiddler-classic. 

I'm configuring a printer to use Fiddler Classic as a remote proxy on a Windows 11 machine to monitor the printer communication with a cloud service.  The printer downloads a print document (several MB) then immediately returns an error to the cloud service saying there's some problem with the document.  It works fine with Fiddler Everywhere.  This will not be fixed on Classic?  Telerik says that Fiddler Classic is no longer being maintained yet new releases (including bug fixes) still seem to be coming out on a regular cadence.

I sned frequent requests between https://gym.whu.edu.cn/api/GSStadiums/GetAppointmentList?Version=2&SportsTypeId=21&AppointmentDate=2024-06-04 and https://gym.whu.edu.cn/api/GSStadiums/GetAppointmentList?Version=2&SportsTypeId=21&AppointmentDate=2024-06-05, I set up an auto-save to txt function,I can see the response in the fiddler,  in the firtst two request ,i can see the response in the txt,but in the following request,  the txt do not update,until over several times , i do it again ,it can be updated, I do want to know why this happen. Addly,if i do the request https://gym.whu.edu.cn/api/GSStadiums/GetAppointmentList?Version=2&SportsTypeId=21&AppointmentDate=2024-06-04  and https://gym.whu.edu.cn/api/GSStadiums/GetOftenList?Version=2 ,i can see the update in real time.
I want to add that I do the request by my manual click. In first way, i just click two buttons on the same interface. in the latter one, i keep opening the screen to return to the previous screen to do the request

I recently upgraded fiddler classic to the latest version, but after the upgrade, my extension file dll did not take effect. Its function is to decrypt traffic, which may be related to the upgrade of fiddler. I read the upgrade description and it seems to be a security-related issue. please help me.

I looked through the documentation and found nothing of value: https://docs.telerik.com/fiddler/extend-fiddler/extendwithdotnet

Fiddler classic the lastest version information:

5.0.20243.10853 [16/05/2024]
fixes:
 Check for updates fails in the beta channel.
 Update third party dependencies to mitigate potential security vulnerabilities.

How to set a dark theme on Fiddler Classic?

After update updating Edge browser to version 124.0.2478.51，when access website I get  "Your connection is not private" 

I have configured Windows to trust Fiddler's root certificate.

I set fiddler " !listen 8889 *.acs.org " and set " fiddler.network.https.SetCNFromSNI true"  It works well  before update edge browser.

After update edge when i access pubs.acs.org it is ok.

but when i access pubs.rsc.org i get   "Your connection is not private" 

 I think this is because someing make fiddler  cannot automatically match certificates .

Please help me fix it ,thanks so much!

 

When accessing the nature website via fiddler, if you check Decrypt HTTPS traffic, error 403 forbidden will appear, unchecked resolve https can be accessed normally. As you can see in the picture below:

hi there

on windows 2022 server when i close fiddler or stop capture traffic

running apps can nor connect tls 1.2

i always get errors for service connecting until start capturing.

What should I do to make the system work properly when the program is closed?

 

Thaks for your help :)

I try many library, last library I try was global-tunnel-ng, but still have no result. Usually I use fiddler to trace various request, my Fiddler listen port 8888, therefore I try to use

I expected to see all request on Fiddler, but there are nothing any request on Fiddler panel. 'localhost' and '127.0.0.1' as ProxyURL also don't working. What I doing wrong?