I've the following configuration on a switch:
aaa authentication fail-message ^CCC
Failled to Authenticate!
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aaa authentication login default group tacacs+ local
aaa authorization exec default group tacacs+ local
aaa authorization network default group tacacs+ local
aaa accounting exec default start-stop group tacacs+
aaa accounting commands 15 default start-stop group tacacs+
tacacs-server host 170.x.x.164 key tennetwork
tacacs-server host 170.x.x.166 key tennetwork
and we have the ACS Server with the switch created, right key, etc. When I try to login with an user which was locally created, everything goes well. But when I try to use an user from an External User Database, in this case Active Directory, even showing authentication ok on the Passed authentications, the Switch is throwing me out, with failed to authenticate message.