You can manage csf from WHM » ConfigServer Security&Firewall.

• To check if any IP address has been blocked, enter the IP address at the textbox next to "Search for IP" and click on it.
• To remove IP address from deny file, enter the IP address at the textbox next to "Remove Deny" and click on it.
• To allow an IP address, enter the IP address at the textbox next to "Quick Allow" and click on it.
• To deny an IP address, enter the IP address at the textbox next to "Quick Deny" and click on it.
• To modify the firewall configuration, click on "Firewall Configuration", make the required changes and click on "Change" to save the configuration. To change the connection tracking limit, look for "CT_LIMIT", change the value for limit and save the configuration file.