HP Onboard Administrator - Manual (Page 325)

Enabling LDAP Directory Services Authentication to Microsoft Active Directory 325
2. Obtain the certificate from the DC by opening a new web browser window to
https://<domain_controller>:636 (where domain_controller is your DC). This HTTPS URL is secure, so
you are prompted to accept a certificate. Click View Certificate.
3. Click the Details tab, and then click Copy to File.