vsftpd匿名用户无法上传！？谁知道问题出在那里呀！

匿名用户无法上传文件
配置文件：
anonymous_enable=YES
#anon_umask=022
local_enable=YES
write_enable=YES
local_umask=022
anon_upload_enable=YES
anon_mkdir_write_enable=YES
dirmessage_enable=YES
xferlog_enable=YES
connect_from_port_20=YES
#chown_uploads=YES
#chown_username=whoever
#xferlog_file=/var/log/vsftpd.log
xferlog_std_format=YES
#idle_session_timeout=600
#data_connection_timeout=120
#nopriv_user=ftpsecure
#async_abor_enable=YES
ascii_upload_enable=YES
ascii_download_enable=YES
ftpd_banner=Welcome to blah FTP service.
#deny_email_enable=YES
#banned_email_file=/etc/vsftpd/banned_emails
#chroot_list_enable=YES
#chroot_list_file=/etc/vsftpd/chroot_list
#ls_recurse_enable=YES
pam_service_name=vsftpd
userlist_enable=YES
listen=YES
tcp_wrappers=YES
目录权限：
[root@ququ ~]# ls -l /var/ |grep ftp
drwxr-xr-x 3 root root 4096 10-17 18:41 ftp
[root@ququ ~]# ls -l /var/ftp
总计 4
drwxrwxrwx 2 root ftp 4096 10-17 18:41 up
防火墙状态：
[root@ququ ~]# cat /etc/selinux/config |grep =
# SELINUX= can take one of these three values:
SELINUX=disabled
# SELINUXTYPE= type of policy in use. Possible values are:
SELINUXTYPE=targeted
[root@ququ ~]# chkconfig --list |grep iptables
iptables 0:关闭 1:关闭 2:启用 3:启用 4:启用 5:启用 6:关闭