Try this solution:
Run:
nano -w /etc/proftpd.conf
Code:
<Global>
PassivePorts 30000 30030
</Global>
Run:
service proftpd restart
nano -w /etc/sysconfig/iptables-config
Code:
IPTABLES_MODULES="nf_conntrack_ftp"
Run:
service iptables restart
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