I've configured an LDAP authentication on my Liferay Portal 6.2 CE.
The problem I figured out is that when users login, my portal ignore completely the password check.
This is the current user mapping:
UUID:
Username: sAMAccountName
Email: userPrincipalName
Password: unicodePwd
Name: givenName
Second name: middleName
Surname: sn
Fullname: cn
Gruppo: memberOf
Moreover, the portal is configured to ignore Liferay internal password authentication, delegating to LDAP:
auth.pipeline.enable.liferay.check=false