About TLS - ldaps search

Hi guys.

I have a problem in Openldap 2.4.33 on RHEL 5.8

I am able to do a *" ldapsearch -x -p 389 -h -D<> -w<> -b<> "*

but i am not able to do

*" ldapsearch -x -p 636 -h -D<> -w<> -b<>*

I have done all the changes in ldap.conf and certificates are working fine.

The weird thing is

*"ldapsearch -x -H **ldaps://hostname* ldaps://hostname* -D <> -w <> -b<> " is working fine.*

What i am trying to do is-- I want to disable the 389 port so that is no searches running in the non-secure port.

So can any1 tell me why the *" ldapsearch -x -p 636 -h -D<> -w<> -b<>" [secure search is not working]*

Please help me out in this.

Thanks in advance.

-bhee