https://serverfault.com/questions/301903/cannot-access-port-80-from-remote-location-but-works-on-local
Cannot access port 80 from remote location but works on local?
I have a linux server on configuration with apache. However I cannot get access to it using a remote computer.
I can ssh to the server normally.
my IP table
netstat -ant
Active Internet connections (servers and established) Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN tcp 0 0 SERVERIP:80 0.0.0.0:* LISTEN tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN tcp 0 0 0.0.0.0:45117 0.0.0.0:* LISTEN tcp 0 196 SERVERIP:22 MyIP:3149 ESTABLISHED tcp 0 0 :::111 :::* LISTEN tcp 0 0 :::22 :::* LISTEN tcp 0 0 :::47193 :::* LISTEN
Answers
You need to enable access to your server on port 80 as it is currently being blocked by iptables.
sudo /sbin/iptables -I INPUT -p tcp -m tcp --dport 80 -j ACCEPT
This will insert the rule into your iptables configuration at the start. Once you have done this and tested that it works then you should save the configuration so that it it is used next time the service starts,
sudo /sbin/service iptables save
this will write the current configuration to /etc/sysconfig/iptables.
If you use CentOS 7 then FirewallD is the right way to go:
firewall-cmd --zone=public --add-port=80/tcp
Verify with your browser that it works, and then:
firewall-cmd --zone=public --add-port=80/tcp --permanent
firewall-cmd --reload
To make changes permanent