There are number of howtos about changing a lost password in iLO. They’re all talking about properly formatted xml file and hponcfg.
But what if you get this message?
$ hponcfg HP Lights-Out Online Configuration utility Version 4.0.0 Date 12/08/2011 (c) Hewlett-Packard Company, 2011 ERROR: Could not find the Management Processor Device Node. Please check if the iLO driver module is installed and running properly. ACTION REQUIRED: Install/Re-install hp Lights-Out driver package('hp-ilo' RPM) for iLO.
It’s worth verifying, that it’s really iLO not Lights-Out 100!
Lights-Out 100 (or LO100) is a standard IPMI device.
It’s easy to manage:
# if admin is 6th user
$ ipmitool user enable 6
$ ipmitool user set password 6 admin