cookies question

[Wokawidget]

I am using 2005 Beta 2 with the following code:

Private Const SECURITY_COOKIE As String = "Security"
    Private Const GUID_KEY As String = "GUID"
 
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Dim Cookie As HttpCookie = Request.Cookies.Item(SECURITY_COOKIE)
        Dim Passed As Boolean
        If Not (Cookie Is Nothing) Then
            Dim GUID As String = Cookie.Item(GUID_KEY)
            If GUID = String.Empty Then
                CreateSecurityCookie()
            Else
                Passed = True
            End If
        Else
            'always this line...always :o(
            CreateSecurityCookie()
        End If
        Dim Woof As HttpCookie = Request.Cookies.Item(SECURITY_COOKIE)
        If Woof Is Nothing Then
            'never here as it's just been created above, so of course it exists
            Passed = False
        End If
    End Sub
 
    Private Sub CreateSecurityCookie()
        Dim NewCookie As New HttpCookie(SECURITY_COOKIE)
        Dim dt As DateTime = DateTime.Now
        Dim ds As New TimeSpan(0, 0, 20, 0)
        NewCookie.Expires = dt.Add(ds)
        NewCookie.Item(GUID_KEY) = "Woof"
        Request.Cookies.Add(NewCookie)
    End Sub

But it always hits that line of code when I refresh the page...surely 20min lifespan is long enough. The cookie is always NOTHING when I refresh the page.
How come it doesn't remember the cookie?

Am I being daft?

Woof