500 OOPS: cannot open config file:/etc/vsftpd/vsftpd.conf

Question

I don't know why it cannot open config file.

$ ll /etc/vsftpd/vsftpd.conf
-rw-r--r-- 1 xuehui1 root 4182 Aug 20  2012 /etc/vsftpd/vsftpd.conf //exits
$ sudo /usr/sbin/vsftpd /etc/vsftpd/vsftpd.conf
500 OOPS: cannot open config file:/etc/vsftpd/vsftpd.conf

Here is vsftpd.conf,and it works well other linux machines(centos) but this one?Any help would be appreciated..

# Example config file /etc/vsftpd/vsftpd.conf
# Allow anonymous FTP? (Beware - allowed by default if you comment this out).
anonymous_enable=NO
#
# Uncomment this to allow local users to log in.
local_enable=YES
#
# Uncomment this to enable any form of FTP write command.
write_enable=YES
#
# Default umask for local users is 077. You may wish to change this to 022,
# if your users expect that (022 is used by most other ftpd's)
local_umask=022
# Activate directory messages - messages given to remote users when they
# go into a certain directory.
dirmessage_enable=YES
#
# Activate logging of uploads/downloads.
xferlog_enable=YES
#
# Make sure PORT transfer connections originate from port 20 (ftp-data).
connect_from_port_20=YES
#
# If you want, you can have your log file in standard ftpd xferlog format
xferlog_std_format=YES
#
chroot_local_user=YES
pam_service_name=vsftpd
userlist_enable=YES
#enable for standalone mode
listen=YES
tcp_wrappers=YES
use_localtime=YES

Answer 1

Use service vsftpd [start/restart/stop], not simply vsftpd [start/restart/stop]

Answer 2

It is problem about file's owner. U should set correct owner for config /etc/vsftpd/vsftpd.conf

sudo chown root /etc/vsftpd/vsftpd.conf