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The methods and functionality of Windows password aging differ according to 
whether you are using Windows NT or Windows 2000 and whether you employ 
Active Directory (AD) or Security Accounts Manager (SAM). For information on 
the requirements and configuration of the Windows-based password aging 
feature, see the 

With Cisco Secure ACS, you can install a separate program that enables users to 
change their passwords by using a web-based utility. For more information about 
installing user-changeable passwords, refer to the Web Server Installation for 
Cisco Secure ACS for Windows NT/2000 User-Changeable Passwords quick 
reference card.

In addition to the authentication-related features discussed in this section, the 
following features are provided by Cisco Secure ACS:

Authentication of unknown users with external user databases (see the 

)

Microsoft Windows Callback feature (see the 

Ability to import a UNIX password file to the CiscoSecure user database (see 
the 

Ability for external users to authenticate via an enable password (see the 

)

Proxy of authentication requests to other AAA servers (see the 

Configurable character string stripping from proxied authentication requests 
(see the 

)