Why Location path security not working

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C#

ASP.NET

I have the following setup, but when I access the ManageContacts.aspx (from IIS express), it does not point me to the login.aspx, did I do anything wrong ? Simple password are for illustration purpose only.

<location path="~/ManageContacts.aspx">
    <system.web>
      <authorization>
        <deny users="?"/>
        <allow users="admin"/>
      </authorization>

      <authentication mode="Forms">
        <forms loginUrl="~/Account/Login">
          <credentials>
            <user name="admin" password="123456"/>
          </credentials>
        </forms>
      </authentication>

    </system.web>
  </location>