Has anyone encountered problems some user IDs can't login after the
Company Non-stop Ux was restarted except the default users ( for
example: root,etc)? And, these User IDs even couldn't be "su - ****"
from root user.

The error message is:
UX:su: ERROR: Unknown user id: ****

The usenames are exist in the /etc/passwd and /etc/shadow yet.