The inetutils /bin/ftp gives back the message "550 SSL/TLS required on the control channel" in my case. (The debug and verbose command line options do not produce any more related information than that). However, other clients (lftp, ncftp, filezilla) do connect (using the same server and user). gnutls and openssl are installed on my system. Is my system badly configured, do I misunderstand something, or is this a known problem?