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

If anyone is trying to solve this for a .NET Application

Add a P3P header as Carlos mentioned

HttpContext.Response.AddHeader("p3p", "CP=\"IDC DSP COR ADM DEVi TAIi PSA PSD IVAi IVDi CONi HIS OUR IND CNT\"");

Edit: Even better, if you want to put this in Controller, simply add the following attribute

public class IEP3PHeaderAttribute : FilterAttribute, IResultFilter
{
    public void OnResultExecuting(ResultExecutingContext filterContext)
    {
        // check if the user is using a IE based browser, add a p3p header if true and hasn't already been added
        if (HttpContext.Current.Request.Browser.Browser.ToUpper().Contains("IE"))
        {
            if (System.Web.HttpContext.Current.Response.Headers["p3p"] == null)
            {
                HttpContext.Current.Response.AddHeader("p3p", "CP=\"IDC DSP COR ADM DEVi TAIi PSA PSD IVAi IVDi CONi HIS OUR IND CNT\"");    
            }
        }
    }

    public void OnResultExecuted(ResultExecutedContext filterContext)
    {
    }
}

and then in your controller, e.g. HomeController

[IEP3PHeader]
public class HomeController
{
   public ActionResult DoSomething() {};
   public ActionResult DoSomethingElse() {};
}