Page.User.Identity.IsAuthenticated Returns Object Reference Not Set To Instance Of Object?

Dec 23, 2010

this works fine on my local site but as soon as i upload the site to my live server i get stem.NullReferenceException: Object reference not set to an instance of an object

on the first line of this:

if (!Page.User.Identity.IsAuthenticated)
{
pnlSignIn.Visible = true;
pnlSignOut.Visible = false;
}

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