Poor ESET user design allows for Blocked IP to be unblock, on mass. (ESET Server security - Troubleshooting Wizard)
Dropdown selector for 5min|15min|hour goes directly over the top of the "Unblock" button for server block IP's - this is dangerous as can be accidently clicked if you slightly overshoot the dropdown. Also, if "unblock" IP's is clicked there is no undo.
Having accidently done this myself, I cannot find out if the unblock is permanent or for specific time.
Design of dropdown only needs to be moved to the left to miss accidental unblocking of IP's.