The GNU/Linux firewall will block attempts from other computers to communicate with the database server. In order to circumvent this, the ports used by the database server must be opened.
How to allow connections to the database server to go through the firewall on CentOS 6, RedHat Entreprise Linux 6 or other systems using the iptables service
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Add the ports used by the database server to the list of open ports with the following commands:
$ sudo iptables -I INPUT -m state --state NEW -p tcp -m tcp --dport 5678 -j ACCEPT
$ sudo iptables -I INPUT -m state --state NEW -p tcp -m tcp --dport 5680 -j ACCEPT
$ sudo service iptables save
$ sudo service iptables restart
The GNU/Linux firewall should now allow other machines to connect to the database server.
How to allow connections to the database server to go through the firewall on CentOS 7, RedHat Entreprise Linux 7 or other systems using the firewalld service
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Add the ports used by the database server to the list of open ports with the following commands:
$ sudo firewall-cmd --permanent --zone=public --add-port=5678/tcp
$ sudo firewall-cmd --permanent --zone=public --add-port=5680/tcp
$ sudo firewall-cmd --reload
The GNU/Linux firewall should now allow other machines to connect to the database server.
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