Answer from cPanelDon on cPanel.net forums:
Unless traffic is explicitly blocked by a firewall configuration the ports should be "open."
If the firewall configuration is unknown or if you are seeking a simplified interface for firewall setup I would consider trying CSF that is mentioned in the following forums thread: Third Party Applications Available for cPanel/WHM - cPanel Forums - http://forums.cpanel.net/f77/third-part ... 06785.html
Reference links for "ConfigServer Security & Firewall" (CSF):
ConfigServer Security & Firewall - http://www.configserver.com/cp/csf.html
ConfigServer Scripts Forum - http://forum.configserver.com/
ConfigServer by Way to the Web - http://www.configserver.com/contact.html
Way to the Web Technical Support - http://www.configserver.com/support.html
A note to CWH customers: All of our cPanel VPS plans and dedicated servers come with CSF installed and can be found in WHM on the left hand menu at the very bottom.
Reference: http://forums.cpanel.net/f5/how-open-so ... 48669.html