For cPanel & WHM version 66
Overview
This documentation describes additional steps to use if you install cPanel & WHM with this guide, but still experience problems.
Remember:
- If you check all of the options in this documentation and still experience problems, submit a ticket to cPanel Support.
- To provide cPanel Support with access to your server, read our Grant cPanel Support Access documentation.
License errors
Problem | You see license errors during or after the installation process. |
Explanation | Your license may be expired or improperly configured. |
Solution | To check your cPanel license, perform the following steps:
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Perl installation errors
Problem | You see the following error message during the installation process: Fatal! Perl must be installed before proceeding! |
Explanation | Perl must exist on your server before the installation script for cPanel & WHM can run successfully. If Perl does not exist during installation, the cPanel & WHM installer attempts to install Perl via the
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Solution | Problems with yum generally cause this error. Make certain that yum functions properly on your server. To attempt to install Perl again, run the following command: yum install perl |
High CPU load on Hyper-V
Problem | The server reports a high CPU load, and Hyper-V's Dynamic Memory option is enabled. |
Explanation | This problem is due to an issue with sleep interruptibility in Hyper-V. |
Solution | For more information and a patch to fix the issue, visit the LKML website. |
RPM installation failures
Problem | One or more RPMs fail during installation. |
Explanation | There are several reasons why your operating system's RPM installations may fail. |
Solution | For steps to fix this issue, read our RPM Installation Failures documentation. |
IPv6 support failures
Problem | You experience a fatal IPv6 error during the installation process. |
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Explanation | The system may not include the IPv6 support that cPanel & WHM requires. cPanel & WHM requires that your kernel includes the
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Solution | Ensure that your kernel provides the required support, or that you add the required modules to your kernel. Important: Your server requires this support regardless of whether you wish to enable IPv6 on your server. To disable IPv6 after installation, run the following command: echo 1 > /proc/sys/net/ipv6/conf/all/disable_ipv6 |
DNS problems
Problem | You experience problems that relate to DNS. |
Explanation |
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Solution | To check your server's resolvers, run the following command, where host example.com If this command did not return results, the To determine whether your server can communicate with a resolver, perform the following steps:
Notes:
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Hostname issues
Problem | A cloud-hosted server does not retain the hostname setting. |
Explanation | The |
Solution | For steps to fix this issue, read our Cloud-Hosted Hostname Solution documentation. |
Additional documentation