If you are using code 6.2.x and are trying to create new interfaces on your Cisco FTD device, you may receive this error:
“External proxy invoked LwInterfaceAPI updatePolicyEntriesWithDomain method and ran into an unexpected error”
That’s quite an error and it just doesn’t really help you troubleshoot at all! I tried rebooting and other solutions to no avail.
Finally, the solution was to delete the zone objects completely and then reconfigure the interface.
Odd one for sure…