You can unblock client's IP addresses from the CSF Firewall function in your reseller panel by referring the below steps:
1. Login to the WHM.
2. Go to Home >> Plugins >> Click on 'ConfigServer Security & Firewall'.
3. Here you can Search for the IP block by entering the IP in 'Search iptables for IP address' box.
4. Unblock the IP by entering the IP in 'Remove IP address' box and then click on "Quick Unblock'
You can also set static IP's to be allowed in the firewall and block any IP's as required.
