Long: krb Arg: <level> Help: Enable Kerberos with security <level> Protocols: FTP Requires: Kerberos --- Enable Kerberos authentication and use. The level must be entered and should be one of 'clear', 'safe', 'confidential', or 'private'. Should you use a level that is not one of these, 'private' will instead be used. If this option is used several times, the last one will be used.