Internet Authentication Service
Applies To: Windows Server 2008
In the Windows Server 2003 family, Internet Authentication Service (IAS) is the Microsoft implementation of a Remote Authentication Dial-in User Service (RADIUS) server and proxy.
In Windows Server® 2008, IAS is replaced by Network Policy Server (NPS).
Network Policy Server (NPS) allows you to create and enforce organization-wide network access policies for client health, connection request authentication, and connection request authorization. In addition, you can use NPS as a RADIUS proxy to forward connection requests to NPS or other RADIUS servers that you configure in remote RADIUS server groups.
For more information, see Network Policy Server in the Windows Server 2008 Technical Library (http://go.microsoft.com/fwlink/?LinkId=104545).