<configuration>
   <system.web>
      <authentication mode="None" />

      <!-- The rest of your web.config file settings go here -->

   </system.web>

   <location path="AdminPage.aspx">
      <system.web>
         <authentication mode="Windows" />

         <authorization>
            <allow users="ReutersServer\EvjenB" />
            <deny users="*" />
         </authorization>
      </system.web>
   </location>
</configuration>
