Почему не запускается vsftpd на CentOS 7?

systemctl status vsftpd.service

● vsftpd.service - Vsftpd ftp daemon
Loaded: loaded (/usr/lib/systemd/system/vsftpd.service; enabled; vendor preset: disabled)
Active: failed (Result: exit-code) since Tue 2019-04-30 17:22:07 MSK; 3min 12s ago
Process: 13694 ExecStart=/usr/sbin/vsftpd /etc/vsftpd/vsftpd.conf (code=exited, status=2)

Apr 30 17:22:07 shostvo100vkbot.tk systemd[1]: Starting Vsftpd ftp daemon...
Apr 30 17:22:07 shostvo100vkbot.tk vsftpd[13694]: 500 OOPS: run two copies of vsftpd for IPv4 and IPv6
Apr 30 17:22:07 shostvo100vkbot.tk systemd[1]: vsftpd.service: control process exited, code=exited status=2
Apr 30 17:22:07 shostvo100vkbot.tk systemd[1]: Failed to start Vsftpd ftp daemon.
Apr 30 17:22:07 shostvo100vkbot.tk systemd[1]: Unit vsftpd.service entered failed state.
Apr 30 17:22:07 shostvo100vkbot.tk systemd[1]: vsftpd.service failed.

journalctl -xe

Apr 30 17:25:01 shostvo100vkbot.tk CROND[13745]: (root) CMD (/usr/local/mgr5/sbin/cron-core sbin/mgrctl -m co
Apr 30 17:25:23 shostvo100vkbot.tk sshd[13770]: reverse mapping checking getaddrinfo for corrreo.puertomontt.
Apr 30 17:25:23 shostvo100vkbot.tk sshd[13770]: Invalid user system from 200.55.198.147 port 54122
Apr 30 17:25:23 shostvo100vkbot.tk sshd[13770]: input_userauth_request: invalid user system [preauth]
Apr 30 17:25:23 shostvo100vkbot.tk sshd[13770]: pam_unix(sshd:auth): check pass; user unknown
Apr 30 17:25:23 shostvo100vkbot.tk sshd[13770]: pam_unix(sshd:auth): authentication failure; logname= uid=0 e
Apr 30 17:25:25 shostvo100vkbot.tk sshd[13770]: Failed password for invalid user system from 200.55.198.147 p
Apr 30 17:25:25 shostvo100vkbot.tk sshd[13771]: Invalid user bh from 221.131.68.210 port 47370
Apr 30 17:25:25 shostvo100vkbot.tk sshd[13771]: input_userauth_request: invalid user bh [preauth]
Apr 30 17:25:25 shostvo100vkbot.tk sshd[13771]: pam_unix(sshd:auth): check pass; user unknown
Apr 30 17:25:25 shostvo100vkbot.tk sshd[13771]: pam_unix(sshd:auth): authentication failure; logname= uid=0 e
Apr 30 17:25:27 shostvo100vkbot.tk sshd[13771]: Failed password for invalid user bh from 221.131.68.210 port
Apr 30 17:26:01 shostvo100vkbot.tk systemd[1]: Started Session 2866 of user root.
-- Subject: Unit session-2866.scope has finished start-up
-- Defined-By: systemd
-- Support: lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit session-2866.scope has finished starting up.
--
-- The start-up result is done.
Apr 30 17:26:01 shostvo100vkbot.tk systemd[1]: Started Session 2865 of user root.
-- Subject: Unit session-2865.scope has finished start-up
-- Defined-By: systemd
-- Support: lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit session-2865.scope has finished starting up.
--
-- The start-up result is done.
Apr 30 17:26:01 shostvo100vkbot.tk CROND[13795]: (root) CMD (/usr/local/mgr5/sbin/cron-ispmgr sbin/mgrctl -m
Apr 30 17:26:01 shostvo100vkbot.tk CROND[13796]: (root) CMD ( /opt/php71/bin/php -c /usr/local/mgr5/addon/r
Apr 30 17:26:25 shostvo100vkbot.tk sshd[13807]: Invalid user ei from 61.76.169.138 port 8293
Apr 30 17:26:25 shostvo100vkbot.tk sshd[13807]: input_userauth_request: invalid user ei [preauth]
Apr 30 17:26:25 shostvo100vkbot.tk sshd[13807]: pam_unix(sshd:auth): check pass; user unknown
Apr 30 17:26:25 shostvo100vkbot.tk sshd[13807]: pam_unix(sshd:auth): authentication failure; logname= uid=0 e
Apr 30 17:26:27 shostvo100vkbot.tk sshd[13807]: Failed password for invalid user ei from 61.76.169.138 port 8
Apr 30 17:26:27 shostvo100vkbot.tk sshd[13807]: Received disconnect from 61.76.169.138 port 8293:11: Bye Bye
Apr 30 17:26:27 shostvo100vkbot.tk sshd[13807]: Disconnected from 61.76.169.138 port 8293 [preauth]

Нашел на этом-же ресурсе пару вопросов с похожей проблемой и с ошибкой pam_unix(sshd:auth): check pass; user unknown без ответа. Кто знает в чем может быть проблема?