Some times your tunnel may not come up if your IKE proposal is in the "Inactive Proposals" list. To configure the active IKE Proposal select Configuration > System > Tunneling Protocols > IPSec > IKE Proposals . If your IKE proposal is in the "Inactive Proposals" list you can enable it by selecting the IKE proposal. For a better idea check out the following document,
Login to the FXOS chassis manager.
Direct your browser to https://hostname/, and log-in using the user-name and password.
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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...