Cookie not being sent in iframe in IE9

Question

First of all, I\'ve did some research before posting this question, so I know about the P3P Policy and the MSDN article about it. From what I understand, this policy mostly (if

Answer 1

Have you tried adding the the P3P header? It is not as difficult as that article says.

For example in PHP just add this header in the top of the php file:

This exact problem but in a diferent context worked here: Facebook app works on all browsers but not IE8