In addition to what Jan explained - in case your sftp server iaccessible directly from internet - you can directly make the call out of your application - the sftp port (22) is enabled in the firewall for outbound connections.
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In addition to what Jan explained - in case your sftp server iaccessible directly from internet - you can directly make the call out of your application - the sftp port (22) is enabled in the firewall for outbound connections.