How to open port in Linux

Question

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

User · Answer

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

User · Answer

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

[linux] How to open port in Linux

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