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Hi This, seems windows folder permission issue, give write permission and also try changing ownership of the folder. To troubleshoot further, you can check file transfer within same vpc, then try with vpc peering.
Can you provide an architecture diagram?
Have you set-up your own SFTP server using a third-party product on a Windows EC2 machine in AWS? And have you provided a site-to-site VPN between your AWS VPC and the vendor's network? Where exactly is the Fortigate firewall running?
Have you checked if ports have been opened for the appropriate CIDR ranges on the security group of the EC2 machine where your SFTP server, assuming that's the case?
You should also run the checks mentioned in this document - https://aws.amazon.com/premiumsupport/knowledge-center/ec2-windows-unable-connect-port/
we managed to resolve the issue. it was due to folder permission issue. it works now.
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