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@aleksandarB you won't be able to perform cloud lookups for AMP, nor any product updates for URL categories or GeoDB etc - but you don't need to use those features in your ACP. You can still manage the FMC locally.
@llomjaria unfortunately loopbacks are only supported with Static and dynamic VTI tunnels, not RAVPN.
Flexconfig is not an option either, as that applies ASA equivalent commands on the FTD and the ASA doesn't support using a loopback for RAVPN either...
@DJW487 my customer had some Yodeck devices, we authenticated them using 802.1x (PEAP/MSCHAPv2) - per device credentials. As these devices did not require access to the main network, we also segmented them and just gave them internet access.
@Jeff Horton I assume the FTD has a route to the originating source IP via out the outside interface? if the traffic is sent via another interface you may not that traffic in the packet capture.
@Jeff Horton
Perhaps a DNS issue resolving your FQDN?
Connect using the public IP address and see what happens (obviously you will get a warning, but will point to where the issue lies).
Did you take a packet capture, if you see no connection attemp...