from you r log I see on your flags that it is set for Ack and Push. From the log this is a SMTP protocol. My guess is that your mail server is trying to push (Process the user data ASAP) this Ack and your security agent does not allow it or like the process. This may be a security agent configuration issue that you will have to investigate further.
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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...