If the interfaces are configured with identical security levels, you have the "same-security-traffic permit inter-interface" command enabled, and you are running 7.2 or later code, you'll need to have specific rules to pass traffic in each direction between the segments.
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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...