new-bie cyrus-sasl question

[JOYDEEP]

Dear list,

I am using cyrus-imap with ldap. the authentication mechanism I am using
is saslauthd.

my saslauthd.conf file is like
------------------------------------------------
ldap_servers: ldap://127.0.0.1:636
ldap_tls_ciphers: HIGH
ldap_tls_cert_file: /etc/openldap/myca/cert.pem
ldap_tls_key:  /etc/openldap/myca/serverkey.pem
ldap_bind_dn: cn=Manager,dc=opendingo,dc=com
ldap_bind_pw: secret
ldap_search_base: dc=opendingo,dc=com
ldap_scope: sub

ldap_auth_method: custom
ldap_version: 3
ldap_filter: (mail=%u@%d)
---------------------------------------------------------

but it can't contact with ldaps . If I disable the SSL related options
and change port to 389 then I hv no problem to login.
I think there is some configuration error regarding SSL .could any one
kindly point out the mistake if any ?
thanks for your time.