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Hi, Thank you for reaching out.
If done already, could you try to disable source/destination checks on the FTDv instance and see if that helps.
Each EC2 instance performs source/destination checks by default. This means that the instance must be the source or destination of any traffic it sends or receives. However, a NAT instance must be able to send and receive traffic when the source or destination is not itself. Therefore, you must disable source/destination checks on the NAT instance.
You can disable the SrcDestCheck attribute for a NAT instance that's either running or stopped using the console or the command line.
See below to get more details on the feature and how-to:
https://docs.aws.amazon.com/vpc/latest/userguide/VPC_NAT_Instance.html#EIP_Disable_SrcDestCheck
HTH
answered 2 years ago
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Excellent this was the issue thank you so much