Was du anonymisieren solltest, ist die IP-Adresse/Domain des Servers und die benutzten ports.
20 und 21 sind Standard ja.
Poste mal bitte deine gesamte vsftpd.conf und die Einstellung deines Filezilla client´s.
Im anhang findest du meine!
EDIT:
Anbei meine vsftpd.conf
# 20120705 v2.3. vsftpd 2.3.5-ext.1 12.04LTS
#
listen=YES
anonymous_enable=NO
anon_world_readable_only=NO
local_enable=YES
write_enable=YES
local_umask=077
dirmessage_enable=YES
use_localtime=YES
xferlog_enable=YES
connect_from_port_20=YES
nopriv_user=ftpsecure
async_abor_enable=YES
ftpd_banner=Your IP is logged! Be aware to act statefuly, else you will be dismissed!
secure_chroot_dir=/usr/share/empty
#
userlist_enable=YES
userlist_deny=NO
userlist_file=/etc/vsftpd.user_list
chroot_local_user=YES
allow_writable_root=YES
download_enable=YES
#
rsa_cert_file=/etc/ssl/vsftpd/vsftpd.pem
rsa_private_key_file=/etc/ssl/vsftpd/vsftpd.pem
ssl_enable=YES
implicit_ssl=NO
ssl_request_cert=YES
ssl_ciphers=HIGH
ssl_sslv3=YES
ssl_tlsv1=YES
strict_ssl_read_eof=YES
strict_ssl_write_shutdown=YES
force_local_data_ssl=YES
force_local_logins_ssl=YES
debug_ssl=YES
#
require_ssl_reuse=NO
# filezilla does not support this option
#
listen_port=21
pasv_max_port=21
pasv_min_port=20
#
chmod_enable=YES
delete_failed_uploads=YES
hide_ids=YES
log_ftp_protocol=YES
dual_log_enable=YES
#
file_open_mode=0777
ftp_data_port=20
max_clients=0
max_login_fails=3
max_per_ip=2
local_max_rate=102400
#
cmds_allowed=ABOR,ACCT,ALLO,APPE,AUTH,CDUP,CWD,DELE,EPRT,EPSV,HELP,LIST,MDTM,MKD,MODE,NLST,NOOP,OPTS,PASS,PASV,PBSZ,PORT,PROT,PWD,QUIT,REIN,REST,RETR,RMD,RNFR,RNTO,SITE,STAT,STOR,STOU,STRU,SYST,TYPE,USER
cmds_denied=FEAT,LPRT,SMNT,