An 8.4 to 9.1 difference to pay some attention to is the change in IPv6 support. In 9.x the "any" keyword becomes dual-stack and the separate IPv6 access lists go away. Any v4-only rules should switch to "any4".
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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...