Using the Internet Authentication Service

The IAS is the central component in Windows Server 2003 for authenticating, authorizing, and auditing users who connect to a network through a VPN or dial-up access. The IAS server is Microsoft’s implementation of a RADIUS server and proxy. RADIUS is the authentication protocol most commonly used by ISPs. IAS uses data stored on a domain controller to verify the authentication requests received through the RADIUS protocol. When the RADIUS server is part of an Active Directory domain, the server uses the directory service as its user account database. With access to user accounts, the RADIUS server authenticates and authorizes connections.

Note

IAS can be configured for wireless, dial-up, VPN, Internet, ...

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