FTP폴더오류에 대해서..

FTP폴더오류
FTP 서버에서 폴더를 여는 중 오류가 발생했습니다. 이 폴더를 엑세스할 권한이 있는지 확인하십시오.

자세히:
200 Switching to ASCII mode.
200 PORT command succesful. Consier using PASV.
425 Failed to establsh connection.

이런 오류가 납니다. 레뎃9.0이구 vsftp를 설치햇습니다. (두루넷.윈도우xp)어떤분은 잘된다구 하고, 어떤분들은(윈도우xp,하나로) 위와같은 오류가 뜬다고 합니다. 한달째 이러고 있네요..쩝..무엇이 문제일까요?
제 vsftpd.conf 파일이고, 포트번호는 2020입니다.

#Non-anonymous FTP Configurat'n Sample
# 2003.4.19 SAT
# Written by dumca suh, Linuxpia.com
#
# Non-anonymous Global Options
#
anonymous_enable=NO
local_enable=YES
write_enable=YES
local_umask=022
#
# Control Options
#
max_clients=50
max_per_ip=100
one_process_model=NO
idle_session_timeout=120
data_connection_timeout=300
connect_timeout=60
local_max_rate=0
ftpd_banner=Welcome to JOAYO.NET VSFTPD Server.
#
# Security Options
#
chroot_local_user=YES
hide_ids=NO
ls_recurse_enable=NO
connect_from_port_20=YES
xferlog_enable=YES
xferlog_file=/var/log/vsftpd.log
ascii_download_enable=NO
async_abor_enable=NO
#
# Standalone Daemon
listen=YES
listen_port=2020
pam_service_name=vsftpd
pasv_enable=YES

pasv_enable=YES

Active ftp:

FTP server's port 21 from anywhere (Client initiates connection)
FTP server's port 21 to ports > 1024 (Server responds to client's control port)
FTP server's port 20 to ports > 1024 (Server initiates data connection to client's data port)
FTP server's port 20 from ports > 1024 (Client sends ACKs to server's data port)

Passive ftp:

FTP server's port 21 from anywhere (Client initiates connection)
FTP server's port 21 to ports > 1024 (Server responds to client's control port)
FTP server's ports > 1024 from anywhere (Client initiates data connection to random port specified by server)
FTP server's ports > 1024 to remote ports > 1024 (Server sends ACKs (and data) to client's data port)