Our ldap contains data that are not case sensitive (see uniquemember.jpg), since ldaps are not case sensitive, all our ldap request work fine.
The directory configuration in crowd is case sensitive (see crowd-Directory-conf.jpg), we don't obtain the same result if we use lower case or upper case.
It uses to work fine en crowd 1.6.

It affects crowd versions : 2.2, 2.3, 2.4