Tutorial Linux: Opem Port on Linux

open-port-on-linux.md

#Opening a Port on Linux#

1. Check if the port is being used or not (testing port 3000 in this example)

   $ netstat -na | grep 3000
   

2. If the port is in use, then most likely it will be the software firewall blocking you. You can check by running

   $ sudo /sbin/iptables -L
   

3. Check for the port. If it isn’t listed, you will need to add it

   $ sudo vi /etc/sysconfig/iptables
   

4. Copy one of the other lines that is allowing a connection to (–dport) a port, and edit to allow access to your new port.

5. Save the file

6. Restart iptables

   $ sudo /sbin/service iptables restart