Description of problem:

In a red hat linux free derivative (Scientific Linux) version 6.0, 
I would like to configure an openldap replication (between the master ldapm.icgeb.org and the slave ldaps.icgeb.org).
The syncrepl comsumer is configured as:

syncrepl rid=1
        starttls=critical
        provider="ldap://ldapm.icgeb.org:389"
        type=refreshAndPersist
        searchbase="dc=icgeb,dc=org"
        binddn="cn=ldapReplicator,dc=icgeb,dc=org"
        credentials="******"
        bindmethod=simple
        retry="20 3"

when I restart the consumer, in the slave log I always get:

slap_client_connect: URI=ldap://ldapm.icgeb.org:389 Error, ldap_start_tls failed (-11)

However I can successfully run from the slave:

ldapsearch -d 1 -x -v -D "cn=ldapReplicator,dc=icgeb,dc=org" -W -h ldapm.icgeb.org -p 389 -ZZ

Below I produce, part of, the diagnostic output produced by ldapsearch command related to TLS:

TLS: file ca-m.icgeb.org.crt does not end in [.0] - does not appear to be a CA certificate directory file with a properly hashed file name - skipping.
TLS: loaded CA certificate file /etc/openldap/cacerts/129a25e2.0 from CA certificate directory /etc/openldap/cacerts.
TLS: loaded CA certificate file /etc/openldap/cacerts/fec911d0.0 from CA certificate directory /etc/openldap/cacerts.
TLS: file ldap-ldaps.icgeb.org.key does not end in [.0] - does not appear to be a CA certificate directory file with a properly hashed file name - skipping.
TLS: file ldap-ldaps.icgeb.org.crt does not end in [.0] - does not appear to be a CA certificate directory file with a properly hashed file name - skipping.
TLS: file ca-s.icgeb.org.crt does not end in [.0] - does not appear to be a CA certificate directory file with a properly hashed file name - skipping.
TLS: certificate [E=sysadm,CN=ldapm.icgeb.org,OU=Computer Unit,O=ICGEB,ST=Italy,C=IT] is valid
TLS certificate verification: subject: E=sysadm,CN=ldapm.icgeb.org,OU=Computer Unit,O=ICGEB,ST=Italy,C=IT, issuer: CN=m.icgeb.org,E=sysadm,OU=Computer Unit,O=ICGEB,L=Trieste,ST=Italy,C=IT, cipher: AES-256, security level: high, secret key bits: 256, total key bits: 256, cache hits: 0, cache misses: 0, cache not reusable: 0
Enter LDAP Password: 

Maybe I am wrong somewhere...

Version-Release number of selected component (if applicable):

openldap-2.4.23-20.el6.x86_64
openldap-devel-2.4.23-20.el6.x86_64
openldap-clients-2.4.23-20.el6.x86_64
openldap-servers-2.4.23-20.el6.x86_64

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