Overview

Occasionally and sporadically you may identify that AAA is not processing Accounting Requests but Authentication Requests are processed normally.

When the issue occurs, the CLI output of the "Services" command is normal, "Authserv -s" counter  was updating, but the "Acctserv -s" command was freezing as if no Accounting requests were received. Also, no CDR will be generated during that period. But if the PCAP traces were checked, Accounting Requests are actually coming but AAA giving no response.

Solution

The immediate workaround that can resolve this issue was restarting the AAA Services.

Check the PCAP Traces if Duplicate Requests are received on the AAA Server. Since RADIUS Requests are over UDP it is possible that duplicate requests can be received due to the nature of the underlying protocol. If these were identified one solution will be to first check by changing the Duplicate Request Purge Interval to a shorter interval such as 5 seconds:

If that does solve the issue the other alternative will be to disable the Duplicate Request Check Enabled flag to FALSE

Both these configurations can be changed using the below procedure:

• Login to AAA Server Manager UI and go to Server Instance 
• Select the first instance 
• Go to configured services → RAD-ACCT
• Click on Update Service Configuration
• Set the configuration and click on Save
• After making the change select - Synchronize configuration