How to open port in Linux

I have installed and web application which is running on port 8080 on RHEL (centOS). I only have command line access to that machine. I have tried to access that application from my windows machine from which I am connected to server via command-line, but it is giving connection time out error.

Then I have tried to open port 8080. I have added following entry into the iptables.

>-A INPUT -m state --state NEW -m tcp -p tcp --dport 8080 -j ACCEPT

After adding this into the iptables I have restarted it with - /etc/init.d/iptables restart

But still I am not able to access that application from my windows machine.

Am I doing any mistake or missing something?

The following configs works on Cent OS 6 or earlier

As stated above first have to disable selinux.

Step 1 nano /etc/sysconfig/selinux

Make sure the file has this configurations

SELINUX=disabled

SELINUXTYPE=targeted

Then restart the system

Step 2

iptables -A INPUT -m state --state NEW -p tcp --dport 8080 -j ACCEPT

Step 3

sudo service iptables save

For Cent OS 7

step 1

firewall-cmd --zone=public --permanent --add-port=8080/tcp

Step 2

firewall-cmd --reload

First, you should disable selinux, edit file /etc/sysconfig/selinux so it looks like this:

SELINUX=disabled
SELINUXTYPE=targeted

Save file and restart system.

Then you can add the new rule to iptables:

iptables -A INPUT -m state --state NEW -p tcp --dport 8080 -j ACCEPT

and restart iptables with /etc/init.d/iptables restart

If it doesn't work you should check other network settings.