Download openssl and run openssl from https://slproweb.com/products/Win32OpenSSL.html and install it.
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.