3ddf5827_Reference_Guide__Required
[Option] filetransferService [Description] Takes one of the values, DAMN,GridFTP,SSH. If DAMN is specified, "damn.wsdlUrl" property must also specified. If SSH is specified either ssh cedentails need to set up in default locations or gfac.ssh.* properties must be specified. [Required] 
Optional, if not specified GridFTP is asummed.
Reference Guide
Required