Я пытаюсь запустить vsftp в качестве домашнего проекта, но в настоящее время получаю код выхода = 2

Я не знаю, что я делаю неправильно и в чем причина проблемы. Я не устанавливал PAM, и мне это не нужно. Пожалуйста, помогите мне, потому что я не совсем знаком с Linux и новичок в этой области.

Я использую Red Hat Enterprise 7. Я получил копию в своей школе, но она не зарегистрирована.

Ошибки и коды перечислены ниже.

'service vsftpd status' дает мне это:

[root@wyoming vsftpd]# service vsftpd status
Redirecting to /bin/systemctl status  vsftpd.service
vsftpd.service - Vsftpd ftp daemon
   Loaded: loaded (/usr/lib/systemd/system/vsftpd.service; enabled)
   Active: failed (Result: exit-code) since Tue 2017-07-11 21:45:07 SGT; 1min 17s ago
  Process: 6381 ExecStart=/usr/sbin/vsftpd /etc/vsftpd/vsftpd.conf (code=exited, status=2)

Jul 11 21:45:07 wyoming.sads.com systemd[1]: Starting Vsftpd ftp daemon...
Jul 11 21:45:07 wyoming.sads.com systemd[1]: vsftpd.service: control process exited, code=exited status=2
Jul 11 21:45:07 wyoming.sads.com systemd[1]: Failed to start Vsftpd ftp daemon.
Jul 11 21:45:07 wyoming.sads.com systemd[1]: Unit vsftpd.service entered failed state.

'journal -xn' дает мне это:

[root@wyoming vsftpd]# journalctl -xn
-- Logs begin at Tue 2017-07-11 20:10:25 SGT, end at Tue 2017-07-11 21:47:36 SGT. --
Jul 11 21:47:36 wyoming.sads.com pulseaudio[2906]: [pulseaudio] sink-input.c: Failed to create sink input: too many inputs per sink.
Jul 11 21:47:36 wyoming.sads.com pulseaudio[2906]: [pulseaudio] sink-input.c: Failed to create sink input: too many inputs per sink.
Jul 11 21:47:36 wyoming.sads.com pulseaudio[2906]: [pulseaudio] sink-input.c: Failed to create sink input: too many inputs per sink.
Jul 11 21:47:36 wyoming.sads.com pulseaudio[2906]: [pulseaudio] sink-input.c: Failed to create sink input: too many inputs per sink.
Jul 11 21:47:36 wyoming.sads.com pulseaudio[2906]: [pulseaudio] sink-input.c: Failed to create sink input: too many inputs per sink.
Jul 11 21:47:36 wyoming.sads.com pulseaudio[2906]: [pulseaudio] sink-input.c: Failed to create sink input: too many inputs per sink.
Jul 11 21:47:36 wyoming.sads.com pulseaudio[2906]: [pulseaudio] sink-input.c: Failed to create sink input: too many inputs per sink.
Jul 11 21:47:36 wyoming.sads.com pulseaudio[2906]: [pulseaudio] sink-input.c: Failed to create sink input: too many inputs per sink.
Jul 11 21:47:36 wyoming.sads.com pulseaudio[2906]: [pulseaudio] sink-input.c: Failed to create sink input: too many inputs per sink.
Jul 11 21:47:36 wyoming.sads.com pulseaudio[2906]: [pulseaudio] sink-input.c: Failed to create sink input: too many inputs per sink.
[root@wyoming vsftpd]# 

Это мой файл конфигурации для /etc/vsftpd/vsftpd.conf:

# Example config file /etc/vsftpd/vsftpd.conf
#
# The default compiled in settings are fairly paranoid. This sample file
# loosens things up a bit, to make the ftp daemon more usable.
# Please see vsftpd.conf.5 for all compiled in defaults.
#
# READ THIS: This example file is NOT an exhaustive list of vsftpd options.
# Please read the vsftpd.conf.5 manual page to get a full idea of vsftpd's
# capabilities.
#
# Allow anonymous FTP? (Beware - allowed by default if you comment this out).
#anonymous_enable=YES
anonymous_enable=NO
#
# Uncomment this to allow local users to log in.
# When SELinux is enforcing check for SE bool ftp_home_dir
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
#
# Uncomment this to allow the anonymous FTP user to upload files. This only
# has an effect if the above global write enable is activated. Also, you will
# obviously need to create a directory writable by the FTP user.
# When SELinux is enforcing check for SE bool allow_ftpd_anon_write,     allow_ftpd_full_access
#anon_upload_enable=YES
#
# Uncomment this if you want the anonymous FTP user to be able to create
# new directories.
#anon_mkdir_write_enable=YES
#
# 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 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
#
# You may override where the log file goes if you like. The default is shown
# below.
#xferlog_file=/var/log/xferlog
#
# If you want, you can have your log file in standard ftpd xferlog format.
# Note that the default log file location is /var/log/xferlog in this case.
xferlog_std_format=YES
#
# You may change the default value for timing out an idle session.
#idle_session_timeout=600
#
# You may change the default value for timing out a data connection.
#data_connection_timeout=120
#
# It is recommended that you define on your system a unique user which the
# ftp server can use as a totally isolated and unprivileged user.
#nopriv_user=ftpsecure
#
# Enable this and the server will recognise asynchronous ABOR requests. Not
# recommended for security (the code is non-trivial). Not enabling it,
# however, may confuse older FTP clients.
#async_abor_enable=YES
#
# By default the server will pretend to allow ASCII mode but in fact ignore
# the request. Turn on the below options to have the server actually do ASCII
# mangling on files when in ASCII mode.
# Beware that on some FTP servers, ASCII support allows a denial of service
# attack (DoS) via the command "SIZE /big/file" in ASCII mode. vsftpd
# predicted this attack and has always been safe, reporting the size of the
# raw file.
# ASCII mangling is a horrible feature of the protocol.
#ascii_upload_enable=YES
#ascii_download_enable=YES
#
# You may fully customise the login banner string:
ftpd_banner=Welcome to Very Secure FTP Server!.
#
# You may specify a file of disallowed anonymous e-mail addresses. Apparently
# useful for combatting certain DoS attacks.
#deny_email_enable=YES
# (default follows)
#banned_email_file=/etc/vsftpd/banned_emails
#
# You may specify an explicit list of local users to chroot() to their home
# directory. If chroot_local_user is YES, then this list becomes a list of
# users to NOT chroot().
# (Warning! chroot'ing can be very dangerous. If using chroot, make sure that
# the user does not have write access to the top level directory within the
# chroot)
#chroot_local_user=YES
#chroot_list_enable=YES
# (default follows)
#chroot_list_file=/etc/vsftpd/chroot_list
#
# You may activate the "-R" option to the builtin ls. This is disabled by
# default to avoid remote users being able to cause excessive I/O on large
# sites. However, some broken FTP clients such as "ncftp" and "mirror" assume
# the presence of the "-R" option, so there is a strong case for enabling it.
#ls_recurse_enable=YES
#
# When "listen" directive is enabled, vsftpd runs in standalone mode and
# listens on IPv4 sockets. This directive cannot be used in conjunction
# with the listen_ipv6 directive.
listen=NO
#
# This directive enables listening on IPv6 sockets. By default, listening
# on the IPv6 "any" address (::) will accept connections from both IPv6
# and IPv4 clients. It is not necessary to listen on *both* IPv4 and IPv6
# sockets. If you want that (perhaps because you want to listen on specific
# addresses) then you must run two copies of vsftpd with two configuration
# files.
# Make sure, that one of the listen options is commented !!
#listen_ipv6=YES

#ADDED IN                       
#local_max_rate=        #IN BYTES PER SECOND                            
#max_clients=           #Max Number of Clients                          
#max_per_ip=5           #Max Number of Connections Per IP Address               
ssl_enable=YES
allow_anon_ssl=NO
#Choose what you like, It's related to performance
force_local_data_ssl=NO #No SSL for data is faster but less secure
force_local_logins_ssl=YES #Self Explainatory

ssl_tlsv1=YES
ssl_sslv2=YES
ssl_sslv3=YES
#Give path of Generated certs located in /etc/ssl/certs, cert contains private also.
rsa_cert_file=/etc/ssl/certs/vsftpd.pem
rsa_private_key_file=/etc/ssl/certs/vsftpd.pem

pam_service_name=vsftpd
userlist_enable=YES
tcp_wrappers=YES