If communication is to be initiated from the lower security interface to the higher one, you need the conduit. In the case of ftp, the server will probably initiate communication from port 20 to the client on the inside intf. If there is no conduit line in the config, those packets will be dropped because by default you cannot initiate communication from a lower priority intf to a higher one. Sorry for being so long winded.
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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...