VTI tunnel are not supported on FTD. If you mean how to verify status on FMC & FTD.
FMC has Dash board. However this shows only for Anyconnect according to the below document. There is no GUI for IPSEC AFAIK.
You need to login LINA.
> system support diagnostic-cli
Once mode is changed! you are in LINA, it's same as ASA Terminal. You can use below commands to View
show crypto ikev1 sa (for Ikev2 change it to Ikev2 instead of Ikev1)
show crypto ipsec sa peer x.x.x.x details
For Troubleshoot the issue.
debug crypto condition peer x.x.x.x (If you have multiple VPN, its preferred to use condition to avoid debugs of other peers )
debug crypto ikev1 127
debug crypto ipsec 127
Hope this helps.