Cisco states from this message: "If the inside port number is 53, it is likely that the inside host is set up as a caching nameserver. Add an access-list command statement to permit traffic on UDP port 53. If the outside port number is 53, the most likely cause is that a DNS server was too slow to respond, and the query was answered by another server."
We are using default 2 minutes for UDP timeout. I am not sure if a DNS query and response can take more than that ...
And I din't say it before but besides this message the DNS resolution stopped working .... so if PIX is denying extra responses, at least it would permit the firt response and we would be able to resolve names ... but it isn't so.
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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...