problem running TLS with ldap 2.2.17

[Guillaume Rousse <rousse@ccr.jussieu.fr>]

Without TLS, slapd works OK. But when activating it, slapd refuse to start:
Dec 15 23:36:58 ryu slapd2.2[22683]: bdb_db_init: Initializing bdb database
Dec 15 23:36:58 ryu slapd2.2[22683]: main: TLS init def ctx failed: -1
Dec 15 23:36:58 ryu slapd2.2[22683]: slapd stopped.
Dec 15 23:36:58 ryu slapd2.2[22683]: connections_destroy: nothing to 
destroy.

Here is my TLS configuration:
# TLS configuration
TLSCertificateFile      /etc/ssl/crt/ldap.pem
TLSCertificateKeyFile   /etc/ssl/key/ldap.pem
TLSCACertificateFile    /etc/ssl/crt/ca.pem

This happens on mdk 10.1, with openldap 2.2.17. The same configuration, 
with the same certificates, works fine on Debian with openldap 2.1.29.

Any idea ?

--
You never find a lost article until you replace it
		-- Sad Truths of Life n°8