We have a new documentation site for cPanel & WHM! You can find our new documentation site at docs.cpanel.net.

We will continue to maintain our API documentation on this server.

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This document is for a previous release of cPanel & WHM. To view our latest documentation, visit our Home page.

For cPanel & WHM 11.48


Where can I find information about how to obtain a license for cPanel & WHM?

To purchase a license, visit the cPanel Store.

Do I need a license before I install cPanel & WHM?

You may install cPanel & WHM without a license. However, it will not function until you obtain a license.

Free 15 day trial license

To determine whether you are eligible for a free 15 day trial license, perform the following steps:

  1. Obtain your primary IP address. You can obtain your primary IP address with one of the following commands:
    • If you did not install lynx and you connect directly to the internet, run the following command:

      /sbin/ifconfig eth0 |grep inet | awk '{print $2}' | awk -F: '{print $2}'
    • If you use a Virtuozzo or OpenVZ VPS, run the following command:

      /sbin/ifconfig venet0:0 |grep inet | awk '{print $2}' | awk -F: '{print $2}'
  2. Enter your primary IP address in the Trial License Interface to check your eligibility.
  3. If you are eligible, you can also install cPanel & WHM from this interface.

How do I address this error: Content-type: text/plain The Cpanel Key Server said returned 500 Request Denied - No license entry found for your machine (X.X.X.X)! X-DES-KEY: generate error Invalid Lisc File?

This error indicates an issue with your cPanel & WHM license. To address this error, run the following command as the root user:


The /usr/local/cpanel/cpkeyclt script verifies your license. For more information, read our Installation Guide - License Verification documentation.

Can I install cPanel & WHM on Ubuntu?

Read our System Requirements documentation for supported operating systems. We cannot offer technical support for cPanel & WHM installations on other operating systems. Most likely, an installation on an unlisted operating system will not function properly.

How can I uninstall cPanel & WHM?

The best way to uninstall cPanel & WHM is to reformat your server.

Reinstall your operating system to return your server to a default setting if you do not wish to use cPanel & WHM.

How do I set up my cPanel server under a NAT configuration?

cPanel & WHM supports 1:1 NAT configurations. For more information, read our 1:1 NAT documentation.


cPanel & WHM only supports 1:1 NAT configurations.

Why do I have problems with X Windows / XFree86 after I install cPanel?


Do not run cPanel & WHM on a server with X Windows or XFree86.

cPanel, Inc. does not support X Windows or XFree86, due to severe security vulnerabilities. We cannot provide support to reclaim X Windows or Xfree86 on installed cPanel & WHM servers.