Mixed authentication with roles

[FishGuy]

I have the requirement for internal users to acces our web app without loggin in manually so using windows authentication, external users need to be refered to a form based authentication.

Now I have implemented the solution below as described below
http://mvolo.com/blogs/serverside/ar...ntication.aspx

However I also need to employ roles for authorization. The forms side is all set up but I cannot seem to get it to work for the windows side of things has anyone implemented a mixed mode involving roles?

I tried adding in an extra provider

<providers>
<add name="SqlRoleManager" type="System.Web.Security.SqlRoleProvider" connectionStringName="aspnetdbConnection_dev" applicationName="Corp.Web.GSP"/>


but I have no idea how to configure it for usse only by the windows users. Secondly if I set it as the default where i have code like

if (Roles.IsUserInRole("Internal") || Roles.IsUserInRole("SysAdmin") || Roles.IsUserInRole("Sales"))
{

I get an

Method is only supported if the user name parameter matches the user name in the current Windows Identity

error

<add name="WindowsRoleProvider" type="System.Web.Security.WindowsTokenRoleProvider" />