Looks like you've got a ACL problem, did you do command 'clear xlate' and command 'write memory' - If possible can you post your PIX config, remember to exclude sensitive info, like passwords and inside IPs.
Here's the commands added for the DNS server. Most of the time DNS resolves fine, but sometimes it times out. Then the deny would show in the log. My guess is that when a DNS query is made, the DNS root (?) that was suppose to answer, timed out, so another server answer on behalf on the original root server (new connection is made). Deny tcp src outside:126.96.36.199/53 dst dmz1:192.168.2.1/1028 by access-group "acl_out"
If the acl_out access-list contains another line (preceding these two lines) that denies the packet, then the packet is dropped, although these lines say it is permitted. ACL´s are processed at a first match base. So, check your whole acl_out access-list and see if there is a lines which denies ip or udp/tcp 53 traffic to 192.168.2.1
If there is, then rewrite your acl_out in a way that the lines which permits the traffic are preceding the deny rules, then it works.
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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...