17 Answers, 1 is accepted
What changed between the moment you could capture traffic and the moment you could not? Did you update Fiddler? Did you change something else in your setup? Which version of Fiddler are you running now?
Regards,
Tsviatko Yovtchev
Telerik

TLS 1.2 is off by default in Fiddler (there were many buggy implementations so Fiddler negotiated for lower protocol version by default). You can switch it on by adding it to the Protocols list in the HTTPS tab of Options.
Regards,
Tsviatko Yovtchev
Telerik by Progress

It's enabled: "ssl3;tls1.0;tls1.1;tls1.2"
And I recreated certs with BCCertMaker.BCCertMaker and updated them both at PC and Emulator.
Btw, same with my iOS. Can't connect if using Fiddler.


Same error here. Can't browse to Facebook using iOS 10, on iPad Pro 9.7", Telerik Fiddler Web Debugger v4.6.20171.9220
.NET 4.6.2 WinNT 6.1.7601 SP1,
Enabled TLS 1.2 as per the advice above.
Still "Safari cannot ..." error on the iOS screen.

Ah, forgot to mention, I did not upload a cert to iOS.
When I connect to it with ipv4.telerik:8888, it suggests to trust *.google.com. Not sure if it is ok or not.
You should have Fiddler Root Certificate installed on your IOS device. If it is IOS 10.3 could you also check out whether in Settings > General > About > Certificate Trust Testings that certificate has full trust enabled?
Regards,
Tsviatko Yovtchev
Telerik by Progress

If there are no request at all this starts to sound like Fiddler is not set as proxy properly. Is it capturing HTTP? If yes, it should be capturing at least the CONNECTs, which travel on HTTP.
Regards,
Alexander
Progress Telerik


v5.0
it works before, but now it do not work..
tried everything, reset certs, restart fiddler etc.. it just simply not working...do not know why

and I tried to install certs in iOS and Andriod. it also do not work.

Hi
Can we capture number of likes,added comments browsed pages in facebook . If s how do we do it using fiddler
Facebook traffic will be encrypted using HTTPS and Fiddler can Decrypt HTTPS traffic. Although, there are a couple of items that will not allow this to work and I have listed them below.
1. - As outlined in the original post, Certificate Pinning has become common practice for mobile applications. This will block the decryption using the Fiddler root Certificate.
2. - As described in the Using Fiddler with iOS and Android 7 blog post, Android 7+ will ignore installation of all user-installed root certificates. If the root certificate is ignored, the traffic won't be decrypted.
Additionally, since the above items are platform specific, there are no workarounds available.
Please let me know if you need any additional information. Thank you for using the Fiddler Forums.
Regards,
Eric R
Progress Telerik


Hi,
The answer Eric provided is still valid - Fiddler cannot capture traffic from mobile applications that use certificate pinning. Furthermore, the newer Android versions (7+) further limit the ability to use Fiddler with mobile apps - you will need to compile the app with an updated manifest in order to be able to use and trust the Fiddler provided user certificates. There is nothing further we can do in this case - unless you recompile the Facebook app for Android with an updated manifest or use it in a device with android 4,5 or 6, you will not be able to capture traffic from it.