Cisco 3.3 - Manual (Page 627)

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User Guide for Cisco Secure ACS for Windows Server
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Chapter 15 Unknown User Policy
Disabling Unknown User Authentication
Note For more information about the significance of database order, see
Database Search Order, page 15-14 .
Step 4 Click Submit.
Cisco Secure ACS saves and implements the Unknown User Policy configuration
you created. Cisco Secure ACS processes posture validation requests and
unknown user authentication requests using the databases in the order listed in the
Selected Databases list.
Disabling Unknown User Authentication
You can configure Cisco Secure ACS so that it does not provide authentication
service to users who are not in the CiscoSecure user database.
Note This procedure does not affect posture validation. For more information, see
Posture Validation and the Unknown User Policy, page 15-10 .
To turn off unknown user authentication, follow these steps:
Step 1 In the navigation bar, click External User Databases, and then click Unknown
User Policy.
Step 2 Select the Fail the attempt option.
Step 3 Click Submit.
Unknown user authentication is halted. Cisco Secure ACS does not allow
unknown users to authenticate with external user databases.