Search filter for ou=Groups

Hi,

How can I search for displaying all members in ou=Groups only? I added a filter (&(objectClass=posixGroup)(ou=Groups)), but nothing displayed (I can get every entries if the filter is not used)

ldapsearch -x -W -D cn=insecure,dc=ldap,dc=hce,dc=org "(&(objectClass=posixGroup)(ou=Groups)"

# extended LDIF # # LDAPv3 # base <dc=ldap,dc=hce,dc=org> (default) with scope subtree # filter: (&(objectClass=posixGroup)(ou=Groups)) # requesting: ALL #

# search result search: 2 result: 0 Success

# numResponses: 1

Thanks.

jupiter