I'm developing app which uses In-App purchases.
I followed this tutorial for configuring In-App purchases Mock Service but when I tried to test it by this statement :
var t = await Windows.ApplicationModel.Store.CurrentApp.LoadListingInformationByKeywordsAsync(new String[]{"credit"});
I got exception with HRESULT: 0x80072EFD (which means Connection Error : HttpSendRequest failed).

So anyone have clue why the code cannot find the mock service?

btw I think this statement from the toutrial isn't clear for me
Add entry to the HOST file by following the format:
#<IP address of the emulator mock service> marketplaceedgeservice.windowsphone.com
which IP, my real IP or emulator IP?!

Thanks in advance,
Ahmed Rashad