My company has a little widget that plugs into shopping carts. We are running into a problem where setting cookies in IE7 is not working. This is happening because we are a 3rd party because we are embedded into the site via an iframe.
I have seen several post that say the way to solve this problem is by putting a P3P compact policy in the header. As mentioned:
Cookie blocked/not saved in IFRAME in Internet Explorer
I have verified that my P3P policy is in my HTTP header. And it actually works for the first page/step of the shopping cart site, but as soon as there is personal information on the page (like name, address, phone, etc), IE blocks my site and my cookie.
I have tried several different P3P policies and they all don't work at the same place. I have also used the IBM P3P tool to generate my own special P3P policy, but it still doesn't work.
I am at a complete loss.