Internet Authentication Service
Internet Authentication Service (IAS) is the Microsoft implementation of a Remote Authentication Dial-in User Service (RADIUS) server and proxy in Windows Server 2003. As a RADIUS server, IAS performs centralized connection authentication, authorization, and accounting for many types of network access, including wireless and virtual private network (VPN) connections. As a RADIUS proxy, IAS forwards authentication and accounting messages to other RADIUS servers.
In Windows Server 2008, IAS has been replaced with Network Policy Server (NPS).
Featured Resources
.png) | NPS Migration Guide
Guidance for migrating from Internet Authentication Server (IAS) on Windows Server 2003 -- or Network Policy Server (NPS) on Windows Server 2008 -- to a server running Windows Server 2008 R2.
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.png) | Deployment of IEEE 802.1X for Wired Networks Using Microsoft Windows
Download only. Learn how to deploy secure wired access with IEEE 802.1X authentication using authenticating switches, client computers running Windows, and an authentication infrastructure that uses IAS in Windows Server 2003 or Windows 2000 Server.
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| Windows Server 2003 Deployment Kit: Deploying IAS
Get guidelines and recommended processes for designing and deploying IAS as a RADIUS server and proxy in this chapter of the Windows Server 2003 Deployment Kit.
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.png) | Forum thread: IAS to NPS Migration Problems
Query resolved: Trying to use the iasmigreader.exe tool and Connection Request policies to move authentication settings from IAS on Windows 2000 Server to NPS on Windows Server 2008 R2.
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.png) | Hotfix for migrating IAS settings to NPS
This hotfix helps you change MDB files used by IAS in Windows Server 2003 to XML files used by NPS in Windows Server 2008.
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Introductory Overviews
- Product Help: Internet Authentication Service
Get an overview of IAS in Windows Server 2003 including checklists, best practices, procedures, and troubleshooting content. - Network Access Quarantine Control in Windows Server 2003
Get a technical overview of the Network Access Quarantine Control feature of Windows Server 2003, including details about how it works and how to deploy it. - Pattern matching syntax
Most versions of Windows Server 2003 support regular expressions for pattern matching, which you can use to specify the conditions of remote access policy attributes and RADIUS realms. - Realm names
Get an overview of realm names and the role they play in authentication in an IAS environment.
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