I am attempting to do something simple (I thought) - securing my application using roles-based security using Active Directory groups in our Domain.
Specifically, I
You probably just need to add a RoleProvider to your web.config to tell the app how to do searches against AD.
Sample code from here.
<roleManager defaultProvider="WindowsProvider"
enabled="true"
cacheRolesInCookie="false">
<providers>
<add
name="WindowsProvider"
type="System.Web.Security.WindowsTokenRoleProvider" />
</providers>
</roleManager>