LDAP group and member

Hi, i've configured an LDAP connection with my LDAP server. For the users it 
all ok (login and authentication), but i have some problem with the groups. I 
see the groups with LDAP (fron jahia administrator window) but they are 
empty... And if i use the group for autentication and menage object, it not 
work.

The file groups.ldap.properties is
# Configuration file for standard ldap server
groups.ldap.context.factory               = com.sun.jndi.ldap.LdapCtxFactory
groups.ldap.url                           = ldap://ldapserver:389/
groups.ldap.authentification.mode         = simple
groups.ldap.public.bind.dn                = serv100

# if you need to login to do public browsing of the directory, uncomment the 
following line and enter the password.
#groups.ldap.public.bind.password          = password

# attribute holding the group name
groups.ldap.search.attribute              = cn
# base dn search
groups.ldap.search.name	                  = O=azienda,C=IT 
groups.ldap.search.countlimit 	      	  = 50

# objectclasses and member attributes
groups.ldap.search.objectclass            = groupOfNames
groups.ldap.members.attribute 	          = member
groups.ldap.dynamic.search.objectclass    = groupOfNames
groups.ldap.dynamic.members.attribute 	  = member

# if set to false, group members will not be preloaded and members will not 
appear in engines
groups.ldap.preload                       = false

# the following defines the attributes to use for wildcard search such as 
*=*test*
groups.ldap.search.wildcards.attributes   = cn


# Map attribute, that indicate which LDAP attribute to map to Jahia standard 
properties
# Make sure you comment out the ones you are not using, especially if the LDAP
# repository contains same names attributes. If you don't searching goups will
# most probably not work correctly.
groups.ldap.groupname.attribute.map       = cn
groups.ldap.description.attribute.map     = description

Many thanks....
paolo