title: SKErrorUnknown while testing in-app purchase
body: <p>I am working to implement in-app purchase for a project and everything went well except the actual test purchase:
  - I created the app in iTunes (unique ID, submited a binary, then rejected it because this is not the final one)
  - created the in-app purchase items
  - implemented the code
  - created the test account</p>
  
  <p>What is working:
  - I got a valid product from store
  - I got the "Confirm your subscription..." popup
  - I got the "Share your information ..." popup
  - and then i got this error: Code=0 “Cannot connect to iTunes Store” (SKErrorUnknown) </p>
  
  <p>Does anyone have any idea on this one ? (I've been googling for two days ... and nothing seems to work).</p>
  
  <p>Thanks.</p>