By default, the certificate verification feature is disabled. You can enable this feature by adding the following registry value:
On a Windows workstation, click Start > Run to display the Run dialog box.
Type regedit then click OK to open the Registry Editor.
Browse to the HKEY_LOCAL_MACHINE\SOFTWARE\Novell\Login\LDAP registry hive.
Create a new DWORD Value named VerifySSLCert and set it to 1.
Exit the Registry Editor.