Linux opens the specified port __linux

Turn from: http://www.blogjava.net/gdufo/archive/2009/11/17/302717.html

After Tomcat is installed, the default port 8080 is not accessible when the client enters address http://serverAddress:8080.

Because the Linux firewall defaults to shutting down port 8080. Therefore, to be able to access port 8080, there are two ways to turn off the firewall, and the other is to have the firewall open 8080 ports.

The troubleshooting steps for opening port 8080 are as follows:

1, modify the/etc/sysconfig/iptables file, add the following line:

-A rh-firewall-1-input-m state--state new-m tcp-p TCP--dport 8080-j ACCEPT

(Reference:-a input-p tcp-m tcp--dport 11211-j ACCEPT) If you have a port open before, you should add one more line below for example:

-A input-p tcp-m tcp--dport 11211-j ACCEPT

-A input-p tcp-m tcp--dport 1158-j ACCEPT

Restart Iptables
Service Iptables Restart

2, restart the firewall, here are two ways to restart the firewall

A) effective after reboot
Open: Chkconfig iptables on
Close: Chkconfig iptables off

(b) Immediate effect, failure after reboot
Open: Service iptables start
OFF: Service iptables stop

Accessed again from the client, succeeded.

Iptables-a input-p tcp-m multiport--dport 21,20-j