Your best shot is to enable Nat-T on the remote end, this will allow ESP traffic to be encapsulated over UDP 4500. If enabling nat-t on the remote end is not an option check the ipsec-pass-trough inspection engine under the global-policy map:
Login to the FXOS chassis manager.
Direct your browser to https://hostname/, and log-in using the user-name and password.
Go to Help > About and check the current version:
Check the current version availa...
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...