Opening a port on linux
Check if the port is being used or not (testing port 3000 in this example): bash$ netstat -na | grep 3000 If the port is in use, then most likely it will be the software firewall blocking you. You can check by running: bash$ sudo /sbin/iptables -L Check for the port. If it isn’t listed, you will need to add it: bash$ sudo vi /etc/sysconfig/iptables Copy one of the other lines that is allowing a connection to (–dport) a port, and edit to allow access to your new port. Save the file Restart iptables: bash$ sudo /sbin/service iptables restart ...