With the latest Linux kernel version for CentOS 6.4 (for example), neither IPMICFG nor IPMITOOL can be used to access IPMI.
However IPMI is accessible with older Linux kernel and it is working fine via its web-interface.
What is the cause of this issue?
This issue has been reported with Linux Kernel 2.6.32-358.14.1.el6.x86_64.
This kernel is only used by latest OS versions such as CentOS/RHEL 6.4 after updating it.
The problem is because the IPMI service is not started automatically.
By executing these 3 commands the issue is always solved, no matter if IPMI service is not installed or not started.
1. yum install OpenIPMI.x86_64 | 2. chkconfig ipmi on | 3. service ipmi start