I am trying to find info but am struggling a bit. I know that LDAP is supported for proxy auth to a server. But I have a client that expressed they want LDAPv3.
LDAP 3 is compatible with LDAP 2. An LDAP 2 client can connect to an LDAP 3 server (this is a requirement of an LDAP 3 server). However, an LDAP 3 server can choose not to talk to an LDAP 2 client if LDAP 3 features are critical to its application.