[ADMIN] Postgres user authentication with secure LDAP

Hi,

I am trying to configure my Postgres server to use LDAP for authentication. My pg_hba.conf config line is:

ldap ldapserver=ldaps://myldaps.company.com ldapport=636 ldaptls=1  ldapprefix="uid="
ldapsuffix=",ou=People,o=my.company.com"

I queried the LDAP server successfully with the 'ldapsearch' tool with the same DN. However, I cannot get it to work
successfullyon Postgres. I have ssl=on and all server and CA certs installed. 

Postgres version 9.5.6.

Error log:

 could not initialize LDAP: No such file or directory
LDAP authentication failed for user "user1"
 auth_failed, auth.c:288

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Thanks for any helps.
Ron