Problem:

I need to unblock an IP that is currently being blocked by my csf (ConfigServer Security&Firewall) firewall.


Solution:

Login to WHM from an IP that isn't blocked.
Go to ConfigServer Security&Firewall
Remove the IP from the Firewall Deny IPs list

or

SSH to your server from an IP that isn't blocked, and run these commands:

To allow and remove from deny list (replace xxx.xxx.xxx.xxx with your IP Address):
csf -a xxx.xxx.xxx.xxx

To restart csf:
csf -r

you may have to edit /etc/csf/csf.deny manually
you may have to put your IP in /etc/csf/csf.ignore