issues verifying if user is logged in

I am having issues when a user logs in via asp Login control, the IsAuthenticated still seems to come up false... ( yes the username and password is correct)
Can anyone tell me what I might be missing ?
 Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        setupForm()
        If (Page.IsPostBack) Then
            'Dim loggedIn As Boolean = HttpContext.Current.Request.IsAuthenticated
        End If
        If (Not Page.IsPostBack) Then
            'Popup dialog won't fire if user is already in.
            If (Request.IsAuthenticated) Then
 &nbs ...