Raritan Computer DKX2-V2.3.5-0N-E - Manual (Page 208)

Chapter 9: Security Management
199
User Blocking
The User Blocking options specify the criteria by which users are blocked
from accessing the system after the specified number of unsuccessful
login attempts.
The three options are mutually exclusive:
Option Description
Disabled The default option. Users are not blocked
regardless of the number of times they fail
authentication.