HP 6125G Configuration Manual page 148

You can allow a user to log in a certain number of times within a specified period of time after the
password expires, so that the user does not need to change the password immediately. For
example, if you set the maximum number of logins with an expired password to three and the time
period to 15 days, a user can log in three times within 15 days after the password expires.
• Password history
With this feature enabled, the system maintains certain entries of passwords that a user has used.
When a user changes the password, the system checks the new password against the history
passwords and the current password. The new password must be different from the used ones by
at least four characters and the four characters must not be the same. Otherwise, the user will fail
to change the password and the system displays an error message.
You can set the maximum number of history password records for the system to maintain for each
user. When the number of history password records exceeds your setting, the latest record will
overwrite the earliest one.
• Login attempt limit
Limiting the number of consecutive failed login attempts can effectively prevent password
guessing.
If an FTP or virtual terminal line (VTY) user fails authentication due to a password error, the system
adds the user to a password control blacklist. If a user fails to provide the correct password after
the specified number of consecutive attempts, the system takes action as configured:
Prohibiting the user from logging in until the user is removed from the password control blacklist
manually.
Allowing the user to try continuously and removing the user from the password control blacklist
when the user logs in to the system successfully or the blacklist entry times out (the blacklist entry
aging time is one minute).
Prohibiting the user from logging in within a configurable period of time, and allowing the user
to log in again after the period of time elapses or the user is removed from the password control
blacklist.
A password control blacklist can contain up to 1024 entries.
A login attempt using a wrong username will undoubtedly fail but the username will not be added
to the password control blacklist.
Web users failing login authentication are not added to the password control blacklist. Users
accessing the system through the console interface are not blacklisted either, because the system
is unable to obtain the IP addresses of these users and these users are privileged and therefore
relatively secure to the system.
Password composition checking
•
A password can be a combination of characters from the following four categories:
Uppercase letters A to Z
Lowercase letters a to z
Digits 0 to 9
32 special characters: blank space, tilde (~), back quote (`), exclamation point (!), at sign (@),
pound sign (#), dollar sign ($), percent sign (%), caret (^), ampersand sign (&), asterisk (*), left
parenthesis ("("), right parenthesis (")"), underscore (_), plus sign (+), minus sign (-), equal sign
(=), left brace ({), right brace (}), vertical bar (|), left bracket ([), right bracket (]), back slash (\),
colon (:), quotation marks ("), semi-colon (;), apostrophe ('), left angle bracket (<), right angle
bracket (>), comma (,), dot (.), and slash (/)
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