title: not getting any PayPal IPN
body: <p>i am trying to implement paypal payment system on my website.
  i am kinda stuck at receiving IPNs.
  the website is developed in PHP, on ZendFramework and Doctrine 1.2.3</p>
  
  <p>i used the example script located on paypal site for receiving IPNs, however it doesn't work.
  for debugging purposes i left on the IPN page code that just inserts a new entry in a table in my mysql db, so every time i load the page, a new entry is inserted in the DB.</p>
  
  <p>i tried again to use Instant Payment Notification (IPN) simulator from PayPal and try to send a new IPN to that page, however nothing is inserted in the DB, so my best guess is somehow paypal can't reach my page, even though it says IPN successfully sent.</p>
  
  <p>the ipn url is something like: <a href="http://mydomain.com/shop/paypal/ipn" rel="nofollow">http://mydomain.com/shop/paypal/ipn</a></p>