This procedure will explain how to change the password for a telnet admin session on the ASA platform using Cisco ACS TACACS server.
Note: Password change for SSH and ASDM admin sessions are not supported.
WHat is TACACS Server?
TACACS stands for Terminal Access Controller Access Control System. This protocol was used for authentication purpose. It is common for UNIX networks which provide allowance to a remote access server which forward user's credentials in order to determine access related to credentials by an aunthentication server.
TACACS+ is a successor to TACACS. RADIUS has taken place of earlier protocols in now days products. TACACS+ works on TCP and RADIUS works on UDP. Users recommend implementing TACACS+ because TCP is a reliable protocol when compared with UDP. TACACS+ perform authentication,authorization and accounting where as in RADIUS authentication and authorization is possible with user profile.