1) Clear the default firewall rules in FirewallD.
#iptables -F
#iptables -t nat -F
2) Disable firewalld.
#systemctl stop firewalld
#systemctl disable firewalld
#systemctl mask firewalld
3) Install iptables-services.
#yum install iptables-services
#systemctl start iptables
#systemctl enable iptables
4)Clear again the iptables rules.
#iptables -F
#iptables -t nat -F
5) Import iptable rules and saved it or create a new iptable rules.
#iptables-restore < iptables
#service iptables save
#service iptables stop
#service iptables start