I am finding when the TACACS server is unavailable that when telnetting to the Catalyst (CATOS) switch I am being prompted for the username even after it tells you that the server is unavailable.
The TACACS configuration is;
set authentication login tacacs enable telnet primary
set authentication enable tacacs enable telnet primary
!
set authorisation exec enable tacacs+ if-authenticated telnet
set authorisation enable enable tacacs+ if-authenticated telnet
set authorisation commands enable all if-authenticated telnet
Also can you telnet directly into the enable mode if you are authenticated to do so based on your username/password.