I have a pix 515 running dhcp on the outside interface. When a vpn client connects from behind the pix it generates error "protmap translation creation failed for protocol 50 src inside <host> to dst <host>.
It seems - as Salim mentioned above - that you are using a PAT address. For IPSec vpn clients you need to configure a static ip address for the client and allow the remote vpn gateway to reply on ESP (protocol 50).
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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...