The configuration looks good ( Refering to the phase 1 and phase 2 configuration that we can see, The only thing that we cannot determine here is whether the IP addresses set on the peer and tunnel group statements are the right ones and finally the pre-shared key)
So make sure you have the right IP addreses ( You are getting IP address via IPCP so make sure you are using the right one)
Then try to ping the other side.
If connectivity from both sides outside interface IP addresses is fine, I would suggest to check the preshared key
more-system running-config | begin tunnel
Then if you see a match in that as well I would recommend what the user techdata suggested,
A debug crypto isa 255 and then generate traffic across the tunnel
Julio Carvajal Senior Network Security and Core Specialist CCIE #42930, 2xCCNP, JNCIP-SEC
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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...