I believe that what is going on has less to do with differences between the 3745 and the msfc and more to do with version differences and changes in features. The original post indicates these versions are being used:
IOS on 3745s is 12.3(16).
IOS on msfc2 is 12.1(8b)E19.
The key feature in this discussion is the service password-encryption. In earlier versions of code (including 12.1) the use of this feature was for things like the login password on the vty lines, etc. In newer code (like 12.3) the use of the feature expanded and covers things like the tacacs server key. So the 3745 running 12.3 can define the key as crypto text or as clear text. The msfc running 12.1 can only define it as clear text.
I would suggest to the original post that you clear all tacacs keys from the config. Then configure using the tacacs-server key
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...