Setting Internet Authentication Service Properties

The Service tab stores basic settings, including maximum threads, User Datagram Protocol (UDP) port numbers for RADIUS authentication and RADIUS accounting, and packet choices for capture to the Application Log window of the Windows NT Event Viewer.

To set Internet authentication service properties

1. Click the Service tab.
   
   
2. In the Maximum threads box, enter the maximum number of authentication requests that will be processed concurrently. This value must be between 1 and 63. (IAS will only use as many threads as necessary, up to the value of this setting.)
   
   
3. If your RADIUS authentication and RADIUS accounting UDP ports differ from the default values provided, enter your port setting in the Authentication and Accounting boxes.

   The default values are set to the commonly defined RADIUS standards: 1645 for authentication and 1646 for accounting. The most recently defined RADIUS standards at the time of this publication are 1812 for authentication and 1813 for accounting. If you are unsure of your port settings, refer to your NAS documentation.

4. Select one or more check boxes under Capture to NT Event Log to capture packet traffic processed by IAS:
   • Click Malformed or invalid packets to capture problematic packets. Packets are generally malformed as a result of password incompatibility between the client and the server.
     
     
   • Click Authentication packets to capture authentication requests, access approvals, and access denials. This can help to alert you to problems with transaction volume and attempts to access unauthorized resources.
     
     
   • Click Accounting packets to capture accounting requests, approvals, and denials. This can help to alert you to accounting-software compatibility problems between the NAS and IAS.

   The information collected in the NT Event Viewer is valuable for evaluating server performance and for troubleshooting.

Note

The default setting for the Windows NT event log is to reserve 512 kilobytes for the event log file. This may be insufficient if you are logging a significant amount of network traffic.

To log more traffic, click Start, point to Administrative Tools, and then click Event Viewer. Then, on the Log menu in Event Viewer, click Log Settings, and then change the Maximum Log Size setting.

To log only the most recent events, follow the same procedure, and then click Overwrite events as needed.

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