I have configured more than 40 Cisco routers (2811 & 1841) with the following aaa commands:
aaa authentication login default group tacacs+ enable
aaa accounting exec default start-stop group tacacs+
aaa accounting commands 15 default start-stop group tacacs+
aaa accounting network default start-stop group tacacs+
aaa accounting system default start-stop group tacacs+
ip tacacs source-interface fastethernet 0/0
tacacs-server host x.x.x.x key key123
i tried all of them (remote access) and everything works fine.
I surprised that two of them (cisco 2811 & Cisco 1841) i faced an error "error in authentication" when i try to type enable at the user-mode. By the way, i can access them with username & password.
I tried to change the IP address from the ACS server (AAA clients) for these two sites in order to access using enable secret but failed.
I'm using SSH.
Please your help.