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Internet Authentication Service (System Services for the Windows Server 2003 Family and Windows XP Operating Systems)

Applies To: Windows Server 2003, Windows Server 2003 R2, Windows Server 2003 with SP1, Windows Server 2003 with SP2

Service Name: IAS

Executable Name: svchost.exe -k netsvcs

Log On As: LocalSystem

Description: Performs centralized authentication, authorization, auditing, and accounting of users who are connecting to a network (LAN or remote) using VPN (Virtual Private Network) equipment, RAS (Remote Access Service) equipment, or 802.1X Wireless and Ethernet/Switch Access Points. Internet Authentication Service implements the IETF standard RADIUS (Remote Authentication Dial-In User Service) protocol, which enables use of heterogeneous network access equipment.

If IAS is stopped or disabled, authentication requests will fail over to a backup IAS Server, if available. If there is no other backup IAS Servers are available, users will not be able to connect.

Available on: Windows Server 2003, Standard Edition; Windows Server 2003, Enterprise Edition; Windows Server 2003, Datacenter Edition.

Installed through: Add/Remove Programs, Add/Remove Windows Components, Networking Services

Startup type: Automatic

Service status: Started

This service depends on the following system components:

Remote Procedure Call

The following system components depend on this service: None

IP Port Numbers used:

TCP: None

UDP: 1645, 1646, 1812, 1813

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