The FTP protocol is officially defined to use the telnet protocol
	as transport channel for the control connection. However, many
	implementations are broken and does not respect this aspect of
	the FTP protocol.

	If you have trouble accessing files with ASCII code 255 in the
	path or similar problems involving this ASCII code you can
	try setting this directive to off. If that helps, report to the
	operator of the FTP server in question that their FTP server
	is broken and does not follow the FTP standard.