Recently the motherboard of one of the HP ProLiant ML370 G4  was replaced due faulty hardware, but the ILO was never reconfigured back. The ILO board was not reachable anymore on the old IP address. Last weekend we had issues with Active Directory and none of the domain accounts were able to logon locally with a RDP session; so the ops team tried the ILO remote web interface and this failed. Today I was able to find the IP address of the ILO board with the help of the “HP System Management Home Page” tools. I tried to login with the known password but the authentication failed. Couple years ago when these HP servers were deployed there is option in the bios to reset the ILO setting and change the ip and username setting. I do not want to reboot the server and manually reconfigure the ILO board from the console. HP has command line tool for this named HPONCFG. Please go here or search for HPONCFG on google.

HP Lights-Out Online Configuration Utility (HPONCFG)
Version 1.5.2.0

Description
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HP Lights-Out Online Configuration utility is a command line utility used to configure
iLO, iLO 2 and RILOE II from within the Windows operating systems without requiring a
reboot of the server.

I am not able to show the screenshots of HPONCFG.exe tool. The server is managed by third party, but after you installed the cpqsetup.exe on the server you should be able to configure the ILO board.