Download openssl and run the following command.
openssl s_client -connect myldapsserver.domain.com:636
Part of the output of this file will be the Base-64 encoded .cer file that was presented for LDAPS. Just cut and paste into notepad beginning at "--Begin Certificate--" through "---End Certificate---" and save as a .cer Double-click on the certificate file and you will now be viewing the certificate presented for LDAPS.
Once you have found the SSL certificate of the AD server, double click the certificate, go to the tab "Cetification Path"