Following is the configuration of my iptables,
[root@fabulous ~]# vi /etc/sysconfig/iptables
# Generated by iptables-save v1.4.7 on Mon Dec 23 15:55:09 2013
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:RH-Firewall-1-INPUT - [0:0]
-A INPUT -j RH-Firewall-1-INPUT
-A FORWARD -j RH-Firewall-1-INPUT
-A RH-Firewall-1-INPUT -i lo -j ACCEPT
-A RH-Firewall-1-INPUT -p icmp --icmp-type any -j ACCEPT
-A RH-Firewall-1-INPUT -p udp -m tcp --dport 53 -j ACCEPT
-A RH-Firewall-1-INPUT -p tcp -m tcp --dport 53 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 3306 -j ACCEPT
-A RH-Firewall-1-INPUT -m state --state NEW -p tcp --dport 21 -j ACCEPT
-A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT
However, when I restart it, I get error as below, as a notification, the failed line is "COMMIT". Could anyone help to point out where the error is? Thanks in advance.
[root@fabulous ~]# service iptables restart
iptables: Setting chains to policy ACCEPT: filter [ OK ]
iptables: Flushing firewall rules: [ OK ]
iptables: Unloading modules: [ OK ]
iptables: Applying firewall rules: iptables-restore: line 20 failed
[FAILED]
I would say that -m TCP is missing in this line:
-A RH-Firewall-1-INPUT -m state --state NEW -p tcp --dport 21 -j ACCEPT
You can usually get some clues applying the rules yourself with iptables-restore:
iptables-restore < /etc/sysconfig/iptables
EDIT : Spotted it, line 11
-A RH-Firewall-1-INPUT -p udp -m tcp --dport 53 -j ACCEPT
You're specifying udp proto for the tcp module. You probably meant :
-A RH-Firewall-1-INPUT -p udp -m udp --dport 53 -j ACCEPT