Manual

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Switch(config)#authentication line vty login tacacs
44.4 TACACS+ Troubleshooting
In configuring and using TACACS+, the TACACS+ may fail to authentication due to reasons
such as physical connection failure or wrong configurations. The user should ensure the
following:
 First good condition of the TACACS+ server physical connection.
 Second all interface and link protocols are in the UP state (use “show interface”
command).
 Then ensure the TACACS+ key configured on the switch is in accordance with the one
configured on TACACS+ server.
 Finally ensure to connect to the correct TACACS+ server.