What I am seeing look fine. What I dont see is the rest of the ISAKMP configuration on either side. A possiblity is that you are using a firewall with an old software version with different default settings.
Your hunch about the license is incorrect, however, because the PIX would not let you configure a 3des transform set if it did not support it. You can verify this by doing a "show ver" and checking out the encryption 3des/aes license status.
If you want to post the post the output from a "debug crypto isakmp" and a "debug crypto ipsec" as you try to ping from one side to the other that would be helpful.
What I am seeing in this configuration is that you are peering to 2 private addresses. To my knowledge, public addresses need to be used on the outside interfaces (whatever the ISP's have assigned). Nat needs to be configured to apply translations
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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...