SonicOS/X supports TACACS+ accounting Start, Watchdog and Stop messages, but not the TACACS+ accounting proxy, that is, SonicOS/X does not forward the accounting request to the accounting server.
To configure TACACS+ accounting
Navigate to Users > Settings > Accounting.
Next to TACACS+ Accounting, click Configure.
To add a TACACS+ server, click Add Server.
In the Host Name or IP Address field, enter the host name or IP address of the TACACS+ server .
In the Port field, enter the port number of the server. The default is 49.
In the Shared Secret and Confirm Shared Secret fields, enter the shared secret .
Click Enabled when you are ready to put this TACACS+ server into use.