We have a number of FTD devices that, due to a deployment mistake, were all set to the same Unique NAT ID when registered to the FMC. It all works surprisingly well considering the issue, but only if 1 device establishes its connection at a time. However, if they all try to connect at the same time, such as after an FMC reboot, there appears to be mass chaos and the connections to the FMC fail until the FTDs are individually rebooted.
The above is my guess of what is going on, but it seems like a pretty solid guess given I am 100% sure the NAT IDs were all set the same, but they should be unique. Also, yes, we do need NAT IDs because the FMC is Azure hosted and Azure's network fabric always NATs public to privet.
My question, is there a way to change the NAT ID for an existing device? These are deployed in the field and don't have dedicated management IP addresses, so dropping the configuration and reregistering them as new devices is really not an option.
