Can you please post an architecture diagram?
Have you created the SFTP server using AWS Transfer Family?
If so, has it been created with a public endpoint or a private endpoint inside a VPC?
Also please take a look at my answer to a similar question recently - https://repost.aws/questions/QU6AqEnaDmSTa5WBBt776d3w/connect-to-an-internal-sftp-server-from-outside-private-vpc-on-prem#ANX7atpx3iSJK6ssIcY4hpUw
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