ESC配置vsftp虚拟用户，不能登录

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响应:    331 Please specify the password.
命令:    PASS **********
响应:    530 Login incorrect.
错误:    严重错误: 无法连接到服务器
密码正解输入和错误输入   都这样


listen=YES
anonymous_enable=NO
local_enable=YES
write_enable=YES
local_umask=022
dirmessage_enable=YES
use_localtime=YES
xferlog_enable=YES
connect_from_port_20=YES
xferlog_file=/var/log/vsftpd.log
xferlog_std_format=YES
chroot_local_user=YES
chroot_list_enable=no
allow_writeable_chroot=yes
secure_chroot_dir=/var/run/vsftpd/empty
pam_service_name=vsftpd
rsa_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem
rsa_private_key_file=/etc/ssl/private/ssl-cert-snakeoil.key
ssl_enable=NO
guest_enable=YES
pam_service_name=vsftpd.virtual
user_config_dir=/etc/vsftp/vu
pasv_enable=YES
pasv_min_port=30000
pasv_max_port=31000