Check if you have firewall that is blocking the Vpn connection. Make sure following ports are opened on UDP port 500 - Which is for ISAKMP , UDP port 4500 - Which is used when the client is coming through a NAT device , ESP protocol - which is protocol 50 used for encryption. Go through the Acceslist statement carefully to allow the ip traffic on Bvi interface. Refer URL
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...