As I was struggling a long time to get this done right and finally have a solution now I feel that it is a good thing to share with you.
Using LDAP Authentication in iLO enables you to just use your domain credentials instead of endless lists of random passwords.
For AD there is a neat thing and some caveats to consider that caused outages to the iLO login page when done wrong.
The only things you have to fill in here is
– Directory Server Address
– Directory User Context 1 (do not fill in DC=domain,DC=corp) but @domain.corp
– desired LDAP Port (636 by default)
– Use Directory Default Schema
Hope it´s helpful to you.