Dual Authentication in Sitefinity

I have a problem and I was hoping someone could point me in the right direction to get started.  I want to setup a sitefinity site to host our application's support website.  The trick here is that I want only logged in users to be able to access the site.  I want to be able to redirect them from our app (its a web app) to this application when they click on the help link.  I have messed around with putting it all under forms authentication but when I do that the user is then able to access the \sitefintiy directory.  Is there a way to require forms authentication twice in the same application?  Ideally I would like to use our authentication to allow a user into the site then Sitefinity authentication to allow the user into the admin part.  Some other ideas I thought about:

Hello Dave,

The easiest way to achieve this would be if you separate members into different roles. For example most of your roles would not have access to the Sitefinity backend, you will only provide permissions to access the back-end to a limited set of roles, for example content editors, administrators. The rest of the roles will only have permissions to view the public pages of Sitefinity.

Regards,
Radoslav Georgiev
the Telerik team

Can I tie sitefinity authentication in to what we already use for our site, or would I need to add a user to both Sitefinity as well as our application?

Hello Dave,

If you use ASP.NET Membersip, Role and Profile providers you can add them to Sitefinity which will allow you to manage these user through Sitefinity's backend. Settings >>Configurations >> Security.

This will allow you to separate the users in roles and grant them with different permissions.

Regards,
Ivan Dimitrov
the Telerik team