为什么我的ftp匿名用户可以访问，本地用户不能访问，提示550错误。

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配置文件如下：


anonymous_enable=YES

local_enable=YES
#local_root=/var/ftp/pub
write_enable=YES
#no_anon_password=YES
local_umask=077
anon_umask=022
anon_upload_enable=YES

anon_mkdir_write_enable=YES

dirmessage_enable=YES

xferlog_enable=YES

connect_from_port_20=YES
anon_max_rate=800000  
# If you want, you can arrange for uploaded anonymous files to be owned by
# a different user. Note! Using "root" for uploaded files is not
# recommended!
#chown_uploads=YES
#chown_username=whoever



ascii_upload_enable=YES
ascii_download_enable=YES

ftpd_banner=Welcome to 408Server FTP service.


chroot_local_user=YES
#chroot_list_enable=YES
# (default follows)
#chroot_list_file=/etc/vsftpd.chroot_list


pam_service_name=vsftpd
userlist_enable=YES
#enable for standalone mode
listen=YES
listen_port=21
tcp_wrappers=YES

请大家帮帮忙看一看！
谢谢！