FTP Authorization Failure time limits

From: msiddhartha@xxxxxxxxxxxxxx
Date: 28 Sep 2007 11:14:41 -0000

Hi,
When an FTP authorization fails thrice continuously, an error called 530: User not logged in (Your password is being rejected) triggers an alarm in some Enterprise SIM solutions.

Can somebody please explain whether there is a time frame for the illegitimate login attempts after which the alarm fires?
To elaborate the query, how much time space is allotted after every individual invalid login attempt for an attacker using Brute force by the FTP server?

Thanks in advance

Cheers!

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