title: LDAP authentication using OpenLDAP, Samba4, FreeIPA and Active Directory
body: <p>Trying to figure out, what LDAP-authentication is. I can authenticate using LDAP against MS Active Directory, Samba4, FreeIPA and OpenLDAP, right?</p>
  
  <p>So, these four software can hold users' auth-data. But why Windows authentication service can not authenticate against OpenLDAP? What AD can tell to Windows OS, that can not be told by OpenLDAP?</p>
  
  <p>If I will build LDAP-authentication for web service, will it be working on all LDAP powered services or not? </p>