You need to leave the settings relative to the Host on 'automatic'. This way the best access system, relating to the used client and to its way of performing the FTP server settings, will be selected. The FTP server on Aruba usually does not require Passive Ftp but, other than being susceptible of variations, it is possible that, in consequence of the configuration and settings of one of your possible nets and interposed Firewall, it will be necessary for you to set passive Ftp.