sftp.oracle.com replaces ftp.oracle.com from 19-July-2013
Oracle recently implemented a new file transfer service that uses the
Secure File Transport Protocol (SFTP). This new service is available for
customers using FTP Software that will support SFTP (e.g., FileZilla),
with host name sftp.oracle.com and port 2021.
Please refer to How to access Oracle's SFTP server (DOC ID 549180.1) for more information