You need to leave the settings relating to the Host on 'automatic'. This way the best access system will be chosen relating to the used client and to its way of interpreting the FTP server settings. The FTP server on Aruba usually does not require Passive Ftp, but other than being susceptible to  variations, it is possible that, in consequence of the configuration and of the settings of a possible net of yours and of the interposed Firewalls, you may need to set passive Ftp.