使用Java在CentOS ec2实例上使用FTP

Having a problem with FTP transfer from our server (FileZilla, setup in passive mode) to our web application deployed on a CentOS ec2 instance. Manually testing with wget and ftp from the instance, we are able to authenticate, change directory, and fetch files. However, our ec2 deployed webapp does not fetch the files, although it DOES authenticate and navigate successfully. FTP upload in our app works fine on our LAN, and also testing externally (dev laptop on wireless tether, no VPN)Having a problem with FTP transfer from our ser