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amazon ec2 中国区，建立了http服务器后，外网无法访问。

这是个奇怪的问题，在新建的实例搭建里搭建了apache服务器，外网无法访问。是主机设置哪里有了问题，还是因为其他原因？实例内可以访问到外网。


 # 这里是在aws ec2实例内扫描，80端口确实打开。

ubuntu@ip-172-31-26-XX:~$ nmap 127.0.0.1

Starting Nmap 6.40 ( http://nmap.org ) at 2015-08-12 05:56 UTC
Nmap scan report for localhost (127.0.0.1)
Host is up (0.00026s latency).
Not shown: 997 closed ports
PORT     STATE SERVICE
22/tcp   open  ssh
80/tcp   open  http
8080/tcp open  http-proxy

Nmap done: 1 IP address (1 host up) scanned in 0.04 seconds

然后从一台外网主机扫描，80端口被过滤掉了。


 ➜  ~  nmap 54.223.209.XX

Starting Nmap 6.47 ( http://nmap.org ) at 2015-08-12 13:51 CST
Note: Host seems down. If it is really up, but blocking our ping probes, try -Pn
Nmap done: 1 IP address (0 hosts up) scanned in 3.03 seconds

➜  ~  nmap -Pn 54.223.209.XX

Starting Nmap 6.47 ( http://nmap.org ) at 2015-08-12 13:52 CST
Nmap scan report for ec2-54-223-209-XX.cn-north-1.compute.amazonaws.com.cn (54.223.209.XX)
Host is up (0.0079s latency).
Not shown: 996 closed ports
PORT     STATE    SERVICE
22/tcp   open     ssh
80/tcp   filtered http
443/tcp  filtered https
8080/tcp filtered http-proxy

Nmap done: 1 IP address (1 host up) scanned in 1.29 seconds

于是检查防火墙，然并卵。


 ubuntu@ip-172-31-26-XX:~$ sudo iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

对外安全组设置：


 端口    协议        来源                        ciman
22      tcp     0.0.0.0/0                       ✔
0-65535 tcp     0.0.0.0/0                       ✔
80      tcp     0.0.0.0/0, 106.39.200.4/32      ✔
0-65535 udp     0.0.0.0/0                       ✔
-1      icmp    0.0.0.0/0                       ✔


 

 ubuntu@ip-172-31-26-65:~$ sudo lsof -i:80
COMMAND  PID     USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
apache2 6885     root    4u  IPv6  15540      0t0  TCP *:http (LISTEN)
apache2 6888 www-data    4u  IPv6  15540      0t0  TCP *:http (LISTEN)
apache2 6889 www-data    4u  IPv6  15540      0t0  TCP *:http (LISTEN)

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