title: Iframe not reading cookies in IE while p3p header has been set
body: <p>I have a php site with an iframe that leads to a .net site, if the user leaves the website we send the user a email that gives them a link that sets a session and a cookie that will allow the user to return to the site with all their details still filled out, we do this by sending the user to a link that leads to a page that is on the .net sites domain and sets a cookie and a session variable and then redirects to the php page that has the .net IFrame</p>
  
  <p>In Chrome and firefox we have no problems what so ever but with IE the cookie and session are not being read, I have read that the now unused p3p policy is still enforced by IE when cookies are used with iframes so I have set content headers through IIS (and tried to set different cp values as well) but this has changed nothing</p>
  
  <p>does anyone have any idea what I could try to get this working with IE? Thanks</p>
  
  <p><strong>Update</strong></p>
  
  <p>OK so the p3p headers on the domain setting the cookie (and the domain receiving the cookie as well) is <code>p3p    CP="NID DSP ALL COR"</code> and the set cookie header is <code>Set-Cookie  cookiename=CustId=249674; expires=Wed, 23-Oct-2013 08:29:03 GMT; path=/</code>  it also seems to pick up the cookie on the cookies section of the network tab when on the php page with the IFrame,but the request that the iframe makes get no cookies</p>