Hi
I suggest you don't restrict page in web.config using authorization section. Instead, you can handle the authorization in page_load event, then redirect to whatever page you want. If you don't like the hard coded way, what about store the rule in <appSettings>
e.g:
<appSettings>
<add key="FolderName" value="Admin" />
<add key="LoginUrl" value="Admin\login.aspx" />
</appSettings>
--------------read in code behind------------
if (! User.IsInRole("ClauseAdmin")) {
string FoerName= ConfigurationSettings.AppSettings["LoginUrl"];
Response.Redirect(FoerName);
}