fails to start ldaps://

it's openldap-2.4.17 in debian testing I try to config slapd.conf to use ldap ssl.

TLSCACertificateFile cacert.pem TLSCertificateFile ldapclient.pem TLSCertificateKeyFile ldapclientkey.pem TLSVerifyClient never

I could not start slapd after I config TLS in slapd.conf, error info is "Main: TLS init def ctx failed: -69"

the OpenLDAP Admin Guide only mentions CipherSuite in OpenSSL, not GnuTLS. Steve Langasek advice leave TLSCipherSuite blank( http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=462588), and I do config so.

But if I config some specific CipherSuite or just "ALL", error info will be "TLS: could not set cipher list ALL. Main: TLS init def ctx failed: -1"

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