A firewall is commonly built to increase security with cPanel / WHM. ConfigServer Security & Firewall is the most prevalent. Alternatively known as CSF. While this firewall is designed to prevent malicious users from getting unauthorized access to the server, it may also boot you out if it suspects you are an attacker. This usually occurs if there are too many failed cPanel login attempts, or while attempting to access email using webmail, mobile device, or another email client. If this occurs, the IP address can be unblocked (and, if desired, permanently allow access from your IP address).
The default firewall for REGXA Web servers is ConfigServer Security & Firewall (CSF). If you think that a client or customer's IP address has been blocked by the firewall, you may simply rectify the problem using WHM and the ConfigServer Firewall. CSF is administered by WebHost Manager (WHM), and this guide will show you how to unblock and whitelist IP addresses.
CSF may be accessed on the WHM main page in the Plugins area. You may pick ConfigServer Security & Firewall after clicking the Plugin icon. This will expose the firewall's settings, allowing you to block, unblock, and whitelist IP addresses, among other things.
Through this video, You can learn step by step how to unblock IP on WHM - Reseller Website very easily and quickly.
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