CLI Cookbook: Disabling an Admin User
The default domain user created on Delphix Engines is now admin instead of delphix_admin. When engines created before 5.3.1 are upgraded to 5.3.1 or later they will retain their old username 'delphix_admin'. To avoid complications Delphix recommends creating users with an admin role and then Disabling delphix_admin.
To disable your default admin.
ssh into your engine
Go to users and select admin.
Select the default admin and use ‘disable’ command
Commit the operation.
delphix.engine> user select admin
delphix.engine user 'admin'> disable
delphix.engine user 'admin' disable *> commit
delphix.engine user 'admin'>