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Issue upgrading openldap-clients from 2.4.19-15 to 2.4.23-20

Hi all,

We have an OpenLDAP server (RHEL6) running version 2.4.23-15, and we have clients in RHEL5 and RHEL6.
With clients in RHEL5 works properly but I found some problems with RHEL6 clients in versions newer than 2.4.19-15.

In the clients, if I try to upgrade to new versions than 2.4.19-15 then the client stops working:

[root@XX ~]# rpm -qa | grep openldap
openldap-2.4.19-15.el6.x86_64
openldap-clients-2.4.19-15.el6.x86_64
[root@XX ~]# ldapsearch -x -D 'cn=authenticate, ou=System,dc=test, dc=es' '(objectclass=*)' -W -ZZ
Enter LDAP Password: 
# extended LDIF
#
# LDAPv3
......
[root@XX ~]# id esther
uid=63004(esther) gid=50041(test) groups=50041(test)

[root@XX ~]# yum upgrade openldap*
.....
  Updating   : openldap-2.4.23-20.el6.x86_64                                                                                                                                                     1/4 
warning: /etc/openldap/ldap.conf created as /etc/openldap/ldap.conf.rpmnew
  Updating   : openldap-clients-2.4.23-20.el6.x86_64                                                                                                                                             2/4 
  Cleanup    : openldap-clients-2.4.19-15.el6.x86_64                                                                                                                                             3/4 
  Cleanup    : openldap-2.4.19-15.el6.x86_64                                                                                                                                                     4/4 

Updated:
  openldap.x86_64 0:2.4.23-20.el6                                                               openldap-clients.x86_64 0:2.4.23-20.el6                                                              

Complete!

[root@XX ~]# service nslcd restart
Stopping nslcd:                                            [  OK  ]
Starting nslcd:                                            [  OK  ]
[root@XX ~]# id esther
id: esther: No such user
[root@XX ~]# ldapsearch -x -D 'cn=authenticate, ou=System,dc=test, dc=es' '(objectclass=*)' -W -ZZ
ldap_start_tls: Connect error (-11)

I have the same configuration files that used with the older version. I use these configuration files:

/etc/pam_ldap.conf:
base dc=test,dc=es
binddn cn=authenticate,ou=System,dc=test,dc=es
bindpw XXXX
timelimit 120
bind_timelimit 120
idle_timelimit 3600
pam_lookup_policy yes
pam_password exop
nss_initgroups_ignoreusers root,ldap,named,avahi,haldaemon,dbus,radvd,tomcat,radiusd,news,mailman,nscd,gdm
ssl start_tls
uri ldap://ldap1-test ldap://ldap2-test
tls_cacertdir /etc/openldap/cacerts
pam_password md5

/etc/nslcd.conf
uid nslcd
gid ldap
uri ldap://ldap1-test ldap://ldap2-test
base dc=test,dc=es
binddn cn=authenticate,ou=System,dc=test,dc=es
bindpw XXXX
ssl start_tls
tls_cacertdir /etc/openldap/cacerts
timelimit 120
bind_timelimit 120
idle_timelimit 3600

/etc/openldap/ldap.conf:
URI ldap://ldap1-test/ ldap://ldap2-test/
BASE dc=test,dc=es
TLS_CACERT /etc/openldap/cacerts/catest.crt

CAcert file:

[root@XX ~]# ls -l /etc/openldap/cacerts/catest.crt
-rw-r--r--. 1 root root 1655 May 23 15:23 /etc/openldap/cacerts/catest.crt

Any idea on what the issue is? Am I missing anything?

Thanks in advance,
Esther