Не сохраняются куки при авторизации

    protected void btnLogin_Click(object sender, EventArgs e)
    {
        if (!IsValid) return;

        var udc = new UserDbController();

        int userId = udc.IsUserExists(tbLogin.Text, tbPassword.Text);

        if (userId != -1)
        {
            Session["userId"] = userId;
            Session["userLogin"] = tbLogin.Text;
            FormsAuthentication.RedirectFromLoginPage(tbLogin.Text, chkbRememberLogin.Checked);
        }
        else
        {
            lblError.CssClass = "err";
            lblError.Text = "Invalid password - try again, please!<br />";
        }
    }

		<authentication mode="Forms">
			<forms name="WebSiteCookie" 
             loginUrl="Login.aspx" 
             timeout="20" 
             slidingExpiration="true" 
             cookieless="AutoDetect"
             protection="All" 
             requireSSL="false" 
             enableCrossAppRedirects="false" 
             defaultUrl="Default.aspx" 
             path="/" />
		</authentication>

        Dim ticket As New FormsAuthenticationTicket(1, txLogin.Text, Now, Now.AddYears(1), True, "", FormsAuthentication.FormsCookiePath)
        Dim EncryptTicket As String = FormsAuthentication.Encrypt(ticket)
        Dim AUCook As HttpCookie = New HttpCookie(FormsAuthentication.FormsCookieName, EncryptTicket)