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concurrency problem

Hi, i'm using openldap-2.0.27 in a redhat 9 box.

I have installed qmail-ldap, and it the hours of high traffic it can't get a connection to the ldap server, i wrote to the qmail-ldap list, and they toll me that it was a concurrency problem, so I rise the concurrency and the threads to 500, but i still have the same error.

This is how my slapd.conf:

# $OpenLDAP: pkg/ldap/servers/slapd/slapd.conf,v 1.8.8.7 2001/09/27 20:00:31 kurt Exp $
#
# See slapd.conf(5) for details on configuration options.
# This file should NOT be world readable.
#
include /etc/openldap/schema/core.schema
include /etc/openldap/schema/cosine.schema
include /etc/openldap/schema/inetorgperson.schema
include /etc/openldap/schema/nis.schema
include /etc/openldap/schema/redhat/rfc822-MailMember.schema
include /etc/openldap/schema/redhat/autofs.schema
include /etc/openldap/schema/redhat/kerberosobject.schema
include /etc/openldap/schema/qmail.schema
# Define global ACLs to disable default read access.

# Do not enable referrals until AFTER you have a working directory
# service AND an understanding of referrals.
#referral       ldap://root.openldap.org

pidfile //var/run/slapd.pid
argsfile        //var/run/slapd.args

# Create a replication log in /var/lib/ldap for use by slurpd.
#replogfile     /var/lib/ldap/master-slapd.replog

# Load dynamic backend modules:
modulepath     /usr/sbin/openldap
moduleload     back_ldap.la
moduleload     back_ldbm.la
moduleload     back_passwd.la
moduleload     back_shell.la

#
# The next three lines allow use of TLS for connections using a dummy test
# certificate, but you should generate a proper certificate by changing to
# /usr/share/ssl/certs, running "make slapd.pem", and fixing permissions on
# slapd.pem so that the ldap user or group can read it.
TLSCertificateFile /usr/share/ssl/certs/slapd.pem
TLSCertificateKeyFile /usr/share/ssl/certs/slapd.pem
TLSCACertificateFile /usr/share/ssl/certs/ca-bundle.crt
#
# Sample Access Control
# Allow read access of root DSE
# Allow self write access
# Allow authenticated users read access
# Allow anonymous users to authenticate
#
[root@mail service]# more /etc/openldap/slapd.conf
# $OpenLDAP: pkg/ldap/servers/slapd/slapd.conf,v 1.8.8.7 2001/09/27 20:00:31 kurt Exp $
#
# See slapd.conf(5) for details on configuration options.
# This file should NOT be world readable.
#
include /etc/openldap/schema/core.schema
include /etc/openldap/schema/cosine.schema
include /etc/openldap/schema/inetorgperson.schema
include /etc/openldap/schema/nis.schema
include /etc/openldap/schema/redhat/rfc822-MailMember.schema
include /etc/openldap/schema/redhat/autofs.schema
include /etc/openldap/schema/redhat/kerberosobject.schema
include /etc/openldap/schema/qmail.schema
# Define global ACLs to disable default read access.

# Do not enable referrals until AFTER you have a working directory
# service AND an understanding of referrals.
#referral       ldap://root.openldap.org

pidfile //var/run/slapd.pid
argsfile        //var/run/slapd.args

# Create a replication log in /var/lib/ldap for use by slurpd.
#replogfile     /var/lib/ldap/master-slapd.replog

# Load dynamic backend modules:
modulepath     /usr/sbin/openldap
moduleload     back_ldap.la
moduleload     back_ldbm.la
moduleload     back_passwd.la
moduleload     back_shell.la

#
# The next three lines allow use of TLS for connections using a dummy test
# certificate, but you should generate a proper certificate by changing to
# /usr/share/ssl/certs, running "make slapd.pem", and fixing permissions on
# slapd.pem so that the ldap user or group can read it.
TLSCertificateFile /usr/share/ssl/certs/slapd.pem
TLSCertificateKeyFile /usr/share/ssl/certs/slapd.pem
TLSCACertificateFile /usr/share/ssl/certs/ca-bundle.crt
#
# Sample Access Control
#       Allow read access of root DSE
#       Allow self write access
#       Allow authenticated users read access
#       Allow anonymous users to authenticate
#
#access to dn="" by * read
#access to *
#       by self write
#       by users read
#       by anonymous auth
#
# if no access controls are present, the default is:
#       Allow read by all
#
# rootdn can always write!
disallow bind_anon
#concurrency
concurrency 500
threads 500
#######################################################################
# ldbm database definitions
#######################################################################

database        ldbm
suffix          "dc=axsbolivia,dc=com"
#suffix         "o=AXS BOLIVIA,c=BO"
rootdn          "cn=Administrator,dc=axsbolivia,dc=com"
#rootdn         "cn=Administrator,o=AXS BOLIVIA,c=BO"
# Cleartext passwords, especially for the rootdn, should
# be avoided.  See slappasswd(8) and slapd.conf(5) for details.
# Use of strong authentication encouraged.
# rootpw                secret
rootpw {MD5}jbFjDHbd4K1Y0KQkEGBYsw==
# The database directory MUST exist prior to running slapd AND
# should only be accessible by the slapd/tools. Mode 700 recommended.
directory       /var/lib/ldap
# Indices to maintain
index   objectClass,uid,uidNumber,gidNumber,memberUid   eq
index   cn,surname,givenname                    eq,subinitial
index   mail,mailAlternateAddress                   eq,sub
index   accountStatus,mailHost,deliveryMode             eq
index   default                                         sub
# Replicas to which we should propagate changes
#replica host=ldap-1.example.com:389 tls=yes
#       bindmethod=sasl saslmech=GSSAPI
#       authcId=host/ldap-master.example.com@EXAMPLE.COM

Thanks, for the help