Hello guys,
My curiosity needs to be satisfied once again. I may be doing it wrong but I 
wish to know why it doesn't work the way I was thinking.
Anyways, there's ACS42 with FIREWALLS network device group defined in Network 
Interface section. Then I add the ASA firewall as AAA client under this 
FIREWALLS NDG specifying the name of the ASA, IP address, the shared key and 
TACACS+ as the protocol. The ASA is configured accordingly to match the above 
said:

aaa-server ACS42 protocol tacacs+
aaa-server ACS42 (inside) host 192.168.1.152
key cisco123

When I test a user authentication from the ASA  against this ACS server I end 
up with the shared key mismatch:

LABASA(config)# test aaa-server authen ACS42 host 192.168.1.152 username cisco$
INFO: Attempting Authentication test to IP address <192.168.1.152> (timeout: 12 
seconds)
ERROR: Authentication Server not responding: AAA decode failure.. server secret 
mismatch

But when I enter the ASA as an AAA client not belonging to any NDG in ACS the 
authentication goes through without any problems, i.e. the ASA is added under 
(Not Assigned) NDG.
As a comparison, when I do the same thing with the router, i.e. adding the 
router to the specific NDG the authentication goes through as a charm.

Eugene
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