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Password must meet complexity requirements When this setting is enabled, passwords must meet the following criteria: Not contain the user s account name or parts of the user s full name that exceed two consecutive characters Be at least six characters in length Contain characters from three of the following four categories: English uppercase characters (A through Z) English lowercase characters (a through z) Base 10 digits (0 through 9) Nonalphabetic characters (for example, !, $, #, %) Meet complexity requirements when they are changed or created Store passwords using reversible encryption Disabled by default but is required if Challenge-Handshake Authentication Protocol (CHAP) is used for remote access or digest authentication with Internet Information Services (IIS) Enabling this option is not recommended
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By default, on a newly created domain, the settings implemented are strong; check your environment to ensure that you have similar settings In many companies, password complexity is turned off, which is a disaster, and although it may be politically challenging to convince executives that they need a complex password, it is for the good of the company Remember that account policies can be con gured only at the domain level If you create a GPO and con gure account settings and then link at an OU or site level, those account settings will have no effect for domain accounts and will instead affect only local accounts on the computers within the OU or site Prior to Windows Server 2008, you could have only one account policy per domain, and this is still the case in Windows Server 2008, except with a Windows Server 2008 mode domain, you have negrained password policy capabilities that allow you to specify addition password policies based on a user s group membership (see 12, Managing Active Directory and Advanced Concepts ) Account Lockout Policy de nes what you do if a password for an account is incorrect It is designed to lock out an account and make it unusable after a speci ed number of incorrect password attempts in a certain
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amount of time By default, this is not enabled, but it should be The following are the three areas of con guration:
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Account lockout duration The amount of time an account is locked out, in minutes A setting of 0 means the account stays locked out until it is manually enabled A common value is 30 minutes, which is a good balance We don t want a value of 0 because an attacker who just wants to disrupt your company from working would just have to target each account with a wrong password ve times (if ve were the number of incorrect password attempts before lockout), and the account would be locked out until it was manually enabled If the attacker hit every account in the domain, every account would be locked out forever, and you would have no way to log in to enable it This is why 30 minutes is a good amount of time A hacker trying to hack the password would get ve tries and then have to wait 30 minutes, then try another ve, and so on They are not likely to crack a password with only ten tries per hour Account lockout threshold The number of incorrect password attempts before lockout 0 means the account is never locked out 5 is a common value to use Reset account lockout counter after Con gures the counter of incorrect passwords to be reset after a con gured number of minutes Again, 30 minutes is typically used
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The Kerberos Policy area should not be modi ed and is part of the internal workings of Kerberos If you want to view account logon failures on a domain controller, view the Security log and look for Audit Failure keyword event logs with the events ID 4771 You can lter the security log view to show only failure audits by setting the current lter to have Audit Failure for the keywords The following is an example of a logon failure event log:
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Log Name: Source: Date: Event ID: Task Category: Level: Keywords: Security Microsoft-Windows-Security-Auditing 1/27/2008 9:15:49 PM 4771 Kerberos Authentication Service Information Audit Failure
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