If you use the Microsoft user object class, AD will probably disable the new predefined ES users. If you want to use ES predefined users such as SYSAD (for starting and stopping ES regions) and schemaadmin (for MFDS administration), you will need to enable them. On your AD server, open the AD user manager (Active Directory Users and Computers) console. Select one or more users in the right pane, then choose from the main menu.