to fix it simply log in to your ssh and execute this command

[root@s3 ~]# iptables-save > /etc/sysconfig/iptables
[root@s3 ~]# service iptables restart

and you will get this
Flushing firewall rules:                                   [  OK  ]
Setting chains to policy ACCEPT: mangle filter             [  OK  ]
Unloading iptables modules:                                [  OK  ]
Applying iptables firewall rules:                          [  OK  ]
[root@s3 ~]#

UPDATE:
You must ask your hosting provider to enable NAT forwarding.