If no firewall is in use, such as via firewall rules in an iptables configuration, then there is no action required to allow access on a specific port.
Originally Posted by cloferba
The following command may be used to check the iptables status:
Using the same initialization script for iptables (as seen above) it is possible to "stop" and "start" an iptables-based firewall.
# /etc/init.d/iptables status
If a firewall is active and assistance is needed to customize the rule set I recommend checking with the data center staff, on-site systems administrators, or server management team where applicable.