Yes you can install ACS 5.5. when you upgrade from ACS 5.4 to ACS 5.5, it is mandatory to install the pointed patch before you start upgrading from ACS 5.4 version. The name of the patch file is Pointed-PreUpgrade-CSCum04132-5-4-0-46-0a.tar.gpg. You can install this pointed patch directly on FCS candidate build or on top of any cumulative patch version.
For complete upgrade process, please go through the following link:
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...