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Microsoft Resource Kits - Windows 2000 Resource Kit

Iasparse.exe  (Windows 2000 Resource Kit)

The Windows 2000 Resource Kits help IT professionals deploy, manage, and support Windows 2000 operating systems.
There are a number of Windows 2000 Resource Kit software tools available for free download from Microsoft. These tools are listed below, and can help you streamline administrative tasks such as managing Active Directory™, administering security features, working with Group Policy and Terminal Services, automating application deployment, and other important jobs.

Iasparse.exe - IAS Parse Tool
This command-line tool parses Internet Authentication Service (IAS) and remote access server logs and converts them into a readable format. The log file generated both these services is very cryptic to be understood by an ordinary user. IAS can create a log file based on the authentication and accounting requests received from the network access servers when using Remote Access Dial-In User Service (RADIUS) authentication. Remote access server can also log such information when using Microsoft® Windows® 2000 authentication.