In this post, you’ll learn more about the Error CERTSRV_E_DOWNLEVEL_DC_SSL_OR_UPGRADE – 0x80094013 that is returned when working with the COM-based APIs in Win32
Win32 COM Error
CERTSRV_E_DOWNLEVEL_DC_SSL_OR_UPGRADE – 0x80094013
Win32 COM Error Error Description
The contacted domain controller cannot support signed LDAP traffic. Update the domain controller or configure Certificate Services to use SSL for Active Directory access.