I'm feeling som kind of stupid 

I'm running openldap-servers-2.4.23-26.el6_3.2.x86_64 under Centos 6.3. 

Using ldapsearch I get this result: 

ldapsearch -h localhost -x -b 'o=Iddover,c=Net' '(uid=aitiddnet)' 

> # extended LDIF 
> # 
> # LDAPv3 
> # base <o=Iddover,c=Net> with scope subtree 
> # filter: (uid=aitiddnet) 
> # requesting: ALL 
> # 
> 
> # aitiddnet, People, Iddover, Net 
> dn: uid=aitiddnet,ou=People,o=Iddover,c=Net 
> uid: aitiddnet 
> cn: Aitor Garcia Ortega - Iddover.net 
> objectClass: account 
> objectClass: posixAccount 
> objectClass: top 
> objectClass: shadowAccount 
> objectClass: inetLocalMailRecipient 
> userPassword:: ************** 
> shadowLastChange: 14363 
> shadowMax: 99999 
> shadowWarning: 7 
> uidNumber: 546 
> gidNumber: 546 
> gecos: Aitor Garcia Ortega - Iddover.net 
> mailLocalAddress: aitor.garcia@iddover.net 
> mailHost: localhost 
> homeDirectory: /home/aitiddnet 
> loginShell: /bin/bash 
> 
> # search result 
> search: 2 
> result: 0 Success 
> 
> # numResponses: 2 
> # numEntries: 1 

But this seconf ldap serch don't work 

# ldapsearch -h localhost -x -b 'o=Iddover,c=Net' '(uidNumber=546)' 

> # extended LDIF 
> # 
> # LDAPv3 
> # base <o=Iddover,c=Net> with scope subtree 
> # filter: (uidNumber=546) 
> # requesting: ALL 
> # 
> 
> # search result 
> search: 2 
> result: 0 Success 

I really don't undertand. 

In another server with CentOS release 5.6 (Final), 
openldap-servers-2.3.43-12.el5_6.7  and the same database it works well... 

# ldapsearch -h localhost -x -b 'o=Iddover,c=Net' '(uidNumber=546)' 
# extended LDIF 
# 
# LDAPv3 
# base <o=Iddover,c=Net> with scope subtree 
# filter: (uidNumber=546) 
# requesting: ALL 
# 

# search result 
search: 2 
result: 0 Success 

# numResponses: 1 
[root@r300te1 ~]# ldapsearch -h 172.16.6.1 -x -b 'o=Iddover,c=Net' 
'(uidNumber=546)' 
# extended LDIF 
# 
# LDAPv3 
# base <o=Iddover,c=Net> with scope subtree 
# filter: (uidNumber=546) 
# requesting: ALL 
# 

# aitiddnet, People, Iddover, Net 
dn: uid=aitiddnet,ou=People,o=Iddover,c=Net 
uid: aitiddnet 
cn: Aitor Garcia Ortega - Iddover.net 
objectClass: account 
objectClass: posixAccount 
objectClass: top 
objectClass: shadowAccount 
objectClass: inetLocalMailRecipient 
userPassword:: ***************** 
shadowLastChange: 14363 
shadowMax: 99999