Need help regarding LDAP connectivity over SSL

Hi,

I am facing a very serious problem. I am currently unable to get a 
successful LDAP bind over SSL. The LDAP server is Windows AD server with 
SSL enabled on default 636 port. The libraries I use is

    * Mozilla c-sdk 6.0.3
    * NSPR 4.6.4
    * NSS 3.11.4

Here is the sequence of calls I made ...

   1. ldap_set_option ( NULL, LDAP_OPT_SSL, LDAP_OPT_ON )
   2. ldapssl_client_init ( <path to directory that holds cert8.db>, NULL)
   3. ld = ldapssl_init( <server ip address>, <server port>, 1 )
   4. ldap_set_option(ld, LDAP_OPT_PROTOCOL_VERSION, (void*)&version)
   5. ldap_set_option(ld, LDAP_OPT_TIMELIMIT, &timeout )
   6. ldap_set_option(ld, LDAP_OPT_SIZELIMIT, (void *)&maxEntitiesLimit )
   7. ldap_set_option(ld, LDAP_OPT_RECONNECT, LDAP_OPT_ON )
   8. ldap_simple_bind_s(ld, <user dn>, <user passwd>)

The return values from calls 1 to 7 are all LDAP_SUCCESS, whereas the 
return value of call#8 returns LDAP_SERVER_DOWN. Although the server is 
up and running with SSL enabled, and why the error is returning. I have 
also check the settings (server-ip, port, user-dn, user-passwd) using a 
third-party ldap tool, Softera LDAP Administrator, and it works fine, 
confirming that there is some issue either in Mozilla LDAP libraries or 
in my code.

Please help me resolve this issue.

Kashif Ali Siddiqui