This article will guide you through the steps to configure your cookie IP validation settings starting from WHM version 11.28 and higher
1) Log into WHM (http://domainanme/whm)
2) Navigate to “Main” -> “Server Configuration” -> “Tweak Settings” -> “Security Tab”
3) Find “Cookie IP Validation”
For additional details, you can click on the “?” icon. It states: Validate the IP addresses utilized in all cookie-based logins. This will restrict the ability of attackers who gain access to cPanel session cookies from exploiting the cPanel or WebHost Manager interfaces. For this setting to be most effective, proxy domains should also be turned off.
4) Adjust the settings to “Loose” to decrease the frequency of re-authentication. Alternatively, you can disable it completely.
5) Turn off proxy domains. If you skip this step, you will need to use a proxy server with a static IP address to connect and maintain your session.
6) Clear your web browser’s cache and log into cPanel as usual.