After installing the server certificate into Active Directory, test that LDAPS was enabled.
To verify LDAPS in Active Directory
- Start the Active Directory Administration Tool ( - Ldp.exe):- Select Start > Windows System > Run.
- Enter ldp.exe.
 
- Select Connection > Connect. 
 The Connect dialog box appears.
- In the Server field, enter the domain controller to which you want to connect. 
- In the Port field, enter 636. 
- Click OK.