Session ID is lost in iframe

When running a website ( in an iframe the session id is lost after posting a form, the session id changes. When running the very same website outside the iframe, it works perfect

Doe only happen in IE, Firefox and Chrome work OK


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tacotijsmaAuthor Commented:
Found it. It is a security problem (feature) in IE. Solved by the following code:

Response.AppendHeader("P3P", "CP=""CAO PSA OUR""")

This will lower  the security state of the page which results in preserving the session
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