Issue :
After a fresh installation on a CentOS server and following all the standard steps, it is not connecting to WHM on port 2087.
Fix :
CentOS has default iptables (firewall) rules that block access to cPanel ports when out of the box.
You can flush them using the following command :
iptables -F
Also, remove them from /etc/sysconfig/iptables to prevent them from re-appearing on a system reboot or service restart.
This should fix the issue!
Source : cPanel Forum
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