SKErrorDomain Code=0 "Cannot connect to iTunes Store" in IAP iOS Objective c : <p>when i tested IAP for my app, it throws following error</p>

<pre><code>Error Domain=SKErrorDomain Code=0 "Cannot connect to iTunes Store" 
UserInfo={NSLocalizedDescription=Cannot connect to iTunes Store}
</code></pre>

<p>i have tried many links related to this problem but nothing helped.
Moreover the "Product Identifier" are also correct and i also created new sandbox user, but no output. Any help would be great.</p>
