在搭建好的http服务器上重启iptables后，无法访问网页了。关闭iptables后可以访问

本文链接：https://blog.youkuaiyun.com/yeah_lang/article/details/45246893

本文讨论了在配置iptables后，重启导致无法访问网页的故障排查过程。通过检查iptables过滤状态，发现存在冲突设置，并调整iptables项目次序解决了问题。

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11、配置iptable问题
【问题描述】在搭建好的http服务器上重启iptables后，无法访问网页了。关闭iptables后可以访问
查看iptable过滤状态，80端口在可访问状态
[root@bogon log]# service iptables status
Table: filter
Chain INPUT (policy ACCEPT)
num target prot opt source destination
1 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
2 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0
3 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0
4 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22
5 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
6 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:8080
7 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:80
8 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:3690
9 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:21
10 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpts:3000:3010

Chain FORWARD (policy ACCEPT)
num target prot opt source destination
1 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited

Chain OUTPUT (policy ACCEPT)
num target prot opt source destination
【定位过程】
无用功一大堆。。。。
怀疑iptables项目冲突（网上说按先后顺序进行匹配，而列表中有REJECT项）
修改/etc/sysconfig/iptables配置，尝试把其他项目屏蔽。重启iptables后可以访问
最终调整iptables项目次序解决问题
[root@bogon log]# vi /etc/sysconfig/iptables
#-A INPUT -j REJECT --reject-with icmp-host-prohibited
#-A FORWARD -j REJECT --reject-with icmp-host-prohibited
# Firewall configuration written by system-config-firewall
# Manual customization of this file is not recommended.
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 8080 -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 80 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 3690 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 21 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 3000:3010 -j ACCEPT
# reject icmp-host-prohibited must below all, to avoid conflcit
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT