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Hello.
ALB is a load balancer that operates at Layer 7.
Only HTTP and HTTPS can be used as ALB protocols.
Therefore, it is not possible to set ALB at the front of the FTP server.
https://docs.aws.amazon.com/elasticloadbalancing/latest/application/introduction.html
It is also not recommended to FTP to the public.
If you do, we recommend using Site to Site VPN or Client VPN to encrypt your communications.
Setting up a VPN allows connections using private IP addresses.
https://docs.aws.amazon.com/vpn/latest/clientvpn-admin/what-is.html
https://docs.aws.amazon.com/vpn/latest/s2svpn/VPC_VPN.html
Thanks Riku for your response on this, this is my understanding as well. In this case we can't have a site to site VPN - there are solutions under review to replace this legacy solution.
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If VPN is not available, Systems Manager's port forwarding feature may be considered. https://aws.amazon.com/jp/blogs/mt/use-port-forwarding-in-aws-systems-manager-session-manager-to-connect-to-remote-hosts/