On some strange occasion, once you have tried to login into cpanel or WHM, you would be logout with error message: “IP Address Has Changed!”
This is because your Internet Service Provider (ISP) has a short DHCP lease time, causing your IP address to be renewed/released and reassigned while you are logged into cPanel, making it unable to capture your ip address into the log file.
If this is something that does not happen before, please try to contact your ISP to resolve the issue, or to use a temporary proxy service like rxproxy.com until the ISP resolved the issue.