Using the Web Manager : Configuring Authentication : Configuring a TACACS+ authentication server

Configuring a TACACS+ authentication server
When an administrative user selects the Config-Authentication menu option and selects TACACS+ from the Authentication Type pull-down menu, additional fields appear on the Config‑Authentication screen for configuring the TACACS+ server.
Configure a TACACS+ authentication server when the OnBoard appliance or any of the connected devices is to use the TACACS+ authentication method or any of its variations (Local/TACACS+, TACACS+/Local or TACACS+ Down/Local).
The administrative user must obtain the needed information about the TACACS+ server from the server’s administrator. The administrative user must configure the server by filling in the following fields or choosing whether to check or leave unchecked the checkbox that displays when the TACACS+ authentication type is selected:
Work with the TACACS+ server’s administrator to ensure that following types of accounts are set up on the TACACS server and that the administrators of the OnBoard appliance and connected devices know the passwords assigned to the accounts: