Hi @garcetto ,
If openLDAP is configured through code in web application, IIS can support it.
However, Microsoft has its own LDAP policy. You can use Active Domain LADP(AD LDAP) in window server. You can check Active Directory Certificate Services, Active Directory Domain Services, Active Directory Federation Services, DNS Server and IIS when add roles and features in Server Manager. Follow this docs to set LDAP on windows server.
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Best regards,
Bruce Zhang