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asp.net - Session Variables not saved when page is in an iFrame

I have an aspx page with a listbox control. The listbox is populated from a collection that is retrieved from a service when the page loads. When the user selects an item from the listbox the page posts back, adding the retrieved objects to the session before reloading. On the reload I use the session objects instead of having to call the service again.

This all works fine until I access the page from within an iFrame. The Session objects are not retrieved when the page is in an iFrame (Session["blah"] is null). This code works perfectly when the page is not in an iFrame.

I am using IIS7 and windows server 2008. Is there anything I need to do in ISS to allow Session variables to be used in an iFrame? Does anyone know of anything else that may cause this to happen?

Thanks, Neil

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IE gives lower level of trust to 3rd party content loaded in an iframe. This blocks session cookies.

You can solve this by setting a P3P header in IIS:

Name = p3p
Value = CP="IDC DSP COR CURa ADMa OUR IND PHY ONL COM STA"

IIS settings P3P response headers

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