即使服务正常启动，Pure-ftpd 端口也没有打开，可能是什么原因造成的？

Question

我已经在我的 CentOS 6.4 服务器上安装了Pure-ftpd，配置完服务器后我运行了它/etc/init.d/pure-ftpd start ; /etc/init.d/xinetd restart，它表明服务已成功启动。但是当我尝试在端口 21 中连接到服务器时，我收到以下错误：ftp: connect: Connection refused，运行时netstat它显示该端口未打开。我的/etc/pure-ftpd.conf样子是这样的：

AllowAnonymousFXP           no
AllowUserFXP                no
AltLog                     clf:/var/log/pureftpd.log
AnonymousCanCreateDirs      no
AnonymousCantUpload         yes
AnonymousOnly               no
AntiWarez                   yes
AutoRename                  no
BrokenClientsCompatibility  yes
CallUploadScript yes
ChrootEveryone              yes
CustomerProof              yes
Daemonize                   yes
DisplayDotFiles             yes
DontResolve                 yes
LimitRecursion              7500 8
MaxClientsNumber            50
MaxClientsPerIP             8
MaxDiskUsage               99
MaxIdleTime                 180
MaxLoad                     4
MinUID                      500
NoAnonymous                 yes
PAMAuthentication             yes
ProhibitDotFilesRead        no
ProhibitDotFilesWrite       no
PureDB                        /etc/pure-ftpd/pureftpd.pdb
SyslogFacility              ftp
Umask                       133:022
UseFtpUsers                 no
VerboseLog                  yes

/etc/xinetd.d/pure-ftpd：

service ftp
{
        disable = yes
        socket_type             = stream
        wait                    = no
        user                    = root
        server                  = /usr/sbin/pure-config.pl
        server_args             = /etc/pure-ftpd/pure-ftpd.conf
        log_on_success          += DURATION USERID
        log_on_failure          += USERID
        nice                    = 10
}

/etc/pam.d/pure-ftpd看起来像这样： [root@amaftp ~]# cat /etc/pam.d/pure-ftpd

#%PAM-1.0
# Sample PAM configuration file for Pure-FTPd.
# Install it in /etc/pam.d/pure-ftpd or add to /etc/pam.conf
auth       required     pam_listfile.so item=user sense=deny file=/etc/ftpusers onerr=succeed
auth       include      system-auth
auth       required     pam_shells.so
auth       required     pam_nologin.so
account    include      system-auth
password   include      system-auth
session    include      system-auth

[root@amaftp ~]# 我没有使用pure-ftp-ldap/mysql/pgsql。如果我运行，/usr/sbin/pure-ftpd端口将成功打开，并且我能够连接，但我希望它作为守护进程运行，并且我想xinetd管理它。没有任何内容写入日志，甚至没有在日志中创建日志文件/var/log 此外，我在另一台服务器上有完全相同的配置，它在那里运行良好，失败的原因可能是什么？谢谢