Howard Bullock, you have been very helpful, and I appreciate your feedback. I think I know now why its not working. As I understand, these servers and services including the LDAP server, understands and communicate via standard X500 protocol. So what I have to do now is to learn how X500 and AD services works. I have to learn how to do a query using X500 protocol, also a correct defined sytax when doing a query to LDAP and AD services. Let me know if u have any idea regarding.
Thnax a lot 
/C
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