Authentication settings in IIS 7.5 and ASP.Net, what is difference? -

i start learn web programming using iis 7.5 in windows 2008 r2, , asp.net 4.

i notice both iis , asp.net can define authentication rules. in iis, there form authentication setting can redirect user specified page authentication, below:

and then, in asp web.config file, find similar settings:

<authentication mode="forms">   <forms loginurl="~/account/login.aspx" timeout="2880" /> </authentication> 

when finish both settings, assume page request redirect login.aspx page. didn't. confused. how 2 sets of configs work together? , why page request not redirected?

thanks

update

finally working , think understand now. website structure below:

it modifying autherization rules. deny unauthorized users root:

    <authorization>         <deny users="?" />     </authorization> 

css files should allowed users, have styles\web.config:

    <authorization>         <allow users="*" />     </authorization> 

and allow unauthorized users access register.aspx, have account\web.config:

  <location path="register.aspx">     <system.web>       <authorization>         <allow users="*"/>       </authorization>     </system.web>   </location>    <system.web>     <authorization>       <deny users="?"/>     </authorization>   </system.web> 

there's component need configure: authorization. if don't, unauthorized users have access pages , not redirected login page. example:

<authorization>     <deny users="?" /> </authorization> 

this specifies unauthenticated users denied access pages in application. authorization element part of system.web configuration section.