IOS: test app-purchase don't work

I'm testing app purchase for my app. I create an app in itunes-connect and I add an id for apppurchase ex: com.mycompany.puzzle.tree

then when I try开发者_开发技巧 my code I have the alert that ask me apple id and password, but aftera a few of seconds I have an other alert that say it's not possible connect to apple store, why?

There seems to be a lot of this going around in the sandbox environment.

Try these: - Make sure your app bundle has a version number set in the info plist - Create a new sandbox user

The test account was expired .