Redirect to Login when Session Expires (asp 2.0 Form Authentication)

Hi -

I've tried a whole bunch of suggestions I found on msdn to get my site to redirect to a login page when my session expires but I haven't had any luck.  Does anyone know a standard way to so this that is consistent.
My webconfig settings are:

            <authentication mode="Forms">
                  <forms loginUrl="~/Login/Login.aspx" name="adAuthCookie" timeout="1" path="/">
                  </forms>

            </authentication>
            <authorization>
                  <deny users="?"/>
                  <allow users="*"/>
            </authorization>

Global.asax

    void Application_AuthenticateRequest(object sender, EventArgs e)
    {
        string cookieName = FormsAuthentication.FormsCookieName;
        HttpCookie authCookie = Context.Request.Cookies[cookieName];

        if (null == authCookie)
        {
            //There is no authentication cookie.
            return;
        }
        FormsAuthenticationTicket authTicket = null;
        try
        {
            authTicket = FormsAuthentication.Decrypt(authCookie.Value);
        }
        catch (Exception ex)
        {
            //Write the exception to the Event Log.
            return;
        }
        if (null == authTicket)
        {
            //Cookie failed to decrypt.
            return;
        }
        //When the ticket was created, the UserData property was assigned a
        //pipe-delimited string of group names.
        string[] groups = authTicket.UserData.Split(new char[] { '|' });
        //Create an Identity.
        GenericIdentity id = new GenericIdentity(authTicket.Name, "LdapAuthentication");
        //This principal flows throughout the request.
        GenericPrincipal principal = new GenericPrincipal(id, groups);
        Context.User = principal;
    }
    protected void Session_End(Object sender, EventArgs e)
    {
        //having problem with this -- page is not being re-directed when the session expires
        //need to check session state on each page?
        Response.Redirect("Login.aspx");
    }
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