You must enable and set up LDAP authentication properly on the PXE device to use external authentication.
In the illustration, we assume:
techadssl.com
or IP address 192.168.56.3
.Important: Without the SSL encryption enabled, you can type either the domain name or IP address in this field, but you must type the fully qualified domain name if the SSL encryption is enabled.
389
.dc=techadssl,dc=com
as the starting point where your search begins on the AD server.sAMAccountName
because the LDAP server is Microsoft Active Directory.user
because the LDAP server is Microsoft Active Directory.techadssl.com
.Note: If the PXE clock and the LDAP server clock are out of sync, the certificates are considered expired and users are unable to authenticate using LDAP. To ensure proper synchronization, administrators should configure the PXE and the LDAP server to use the same NTP server.