SFTP error from AWD VPC tunnel

Question

We setup one site-to-site tunnel to a 3rd party vendor using our own fortigate firewall.
The tunnel is up and running and we setup one Windows SFTP server in our network for the vendor to do file transfer.
All credentials are shared to them but when they tried to send file to the server, they encountered "File Write error" ERROR Message: Error writing file 3: Permission denied.
Firewall policies at both ends have already enabled all services to pass through.
What could be the reasons why they cannot write to the SFTP server ?

Accepted Answer

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.

Answer

we managed to resolve the issue. it was due to folder permission issue.
it works now.

Answer

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/

SFTP error from AWD VPC tunnel

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