Thanks, A little more detail as to my problem. I have two concentrator's and a PIX. The pix is connected to the concentrator with VPN and 1 concentrator to concentrator VPN. They are running telnet session between sites e.g site A (PIX) to site B(concentrator) and site C (concentrator) to site B. The telnet session kept dropping out when left for a long time. I changed the timeout on the PIX and this solved the problem on this link, between the two concentrators i still have the issue.
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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...