Fiddler not working with windows store apps on windows 8.1

[Anton]

Hi. I use windows 8.1 and need to debug my traffic from winstore apps to remote server. 

I sucessfully used fiddler for these purposes, but it unexpectedly stopped working.
 
Now I see next situation: after running fiddler all my winstore apps unable to send data to remote server. 
From my app I see that after submitting data simply nothing happens. After timeout expired, I get httpexception.

Of course, I know about windows 8 restrictions for winstore apps regard local traffic. And I've used enable loopback utility for this case. 
But recently it stopped work with strange behavior: on start app sucessfully got installed applications list, but unable to refresh it. 
When I press "Refresh" button, I got next error:
Unable to use NetIsoEnumAppContainers to get AppContainer list.
Error Code: 0x5

Attempting manual registry crawl; some information will be unavailable.

And I unable to see any data from my or installed app. Also any installed app is unable to send and receive any data with runned fiddler. 

 I've tried to uninstall\reinstall fiddler but not helps. Do you know something about this problem? Can you help me to solve it?

[EricLaw]

Error code 0x5 is "Access Denied." Are you running the tool as administrator?

What does "I unable to see any data from my or installed app" mean?

[Anton]

Hi Eric. Yes, I run tool as administrator: http://i.imgur.com/BdyB1rb.png

In fiddler log I don't have any record about winstore apps. And any installed winstore app doesn't have access to internet with enabled traffic capturing in fiddler.

[EricLaw]

When you say "don't have any record about winstore apps" I think you're saying that you don't see any rows in Fiddler's Web Sessions list that were sent by a store application? But do those requests actually *succeed* when Fiddler is open? Or do they fail as well?

[Anton]

Sorry for bad english, I've learned it with movies and job internal docs :)

Yes, you right.  Requests generally fails and doesn't appears in web sessions list. It affects only winstore apps. Web browsers works well.

[Adrian]

I am getting a similar error on Windows 8 server.

Running as admin.

Always get the attached errors.

[Eric Lawrence]

Hello, Adrian--

Unfortunately there is no known fix if Microsoft's API fails. Falling back to the registry crawl (which is what happens after the second message) is the only workaround available. You may need to talk to Microsoft Product Support to get help with this problem in the Windows API or your machine's configuration.

(As a hacky workaround, you can also disable the Windows Firewall Service (using Services.msc) while testing. It is the firewall service that blocks Windows Store applications from using the Loopback address.)

Regards,
Eric Lawrence
Telerik

 

 

[Adrian]

Thanks Eric.

[Steve]

I'm getting the same errors as Adrian on my new Windows 2012 R2 Azure VM.  However, when I stopped the Windows Firewall service, I lost my RDP session and had to reboot.  Within the firewall, I see an inbound rule for "FiddlerProxy" to allow Fiddler.exe to access all local and remote ports.  Is there an even broader rule I can add to make this work?

As another possibility, how would I find the Fiddler "AppContainer'sFullName" to try c:\>CheckNetIsolation LoopbackExempt -a as described in http://blogs.msdn.com/b/fiddler/archive/2011/09/14/fiddler-and-windows-8-metro-style-applications-https-and-private-network-capabilities.aspx ?

[Eric Lawrence]

Hello, Steve--

Your best bet would be to use Help > Send Feedback to send us a summary of your problem, including screenshots of whatever error messages you're encountering.

Regards,
Eric Lawrence
Telerik