openldap and qmail-ldap problem

[Federico Edelman Anaya]

Hi, I have installed the last version of qmail-ldap patch and
OpenLDAP-2.0.11.

My slapd.conf:

database        ldbm
suffix          "dc=domain"
rootdn          "cn=Manager,dc=domain"
rootpw          {crypt}cryptedpass
directory       /path/to/ldapdb
index cn,sn,uid pres,eq
index mail,mailAlternateAddress eq
index objectClass eq

defaultaccess   none

access to attr=userPassword
        by dn="cn=Manager,dc=domain" write
        by dn="cn=qmail,dc=domain" read
        by self write
        by * auth

access to *
        by dn="cn=Manager,dc=domain" write
        by dn="cn=qmail,dc=domain" read
        by self read

I generate the entries with slapadd. (150.000)
Later, I generate the index whith slapdindex.

All work fine for a few days. But, when I change the pass of some users
with a perl script (bind method=manager). The qmail-ldaplookup not found
any entry. I regenerate the index with slapindex, but the
qmail-ldaplookup not found.
Third time, I regenerate the index, and qmail-ldap found the entries of
my openldap.

What happen? When I must regenerate the index? any idea?

Thanks very much.