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Lesson 3
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Identifying Client and Server Default Security Settings
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8-27
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Figure 8-8
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Account policies in the Group Policy Object Editor console
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In previous versions of the Windows operating system, these policies are undefined by default. However, Windows Server 2003 enables the following account policies by default and applies them to each domain:
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Enforce Password History Specifies the number of unique passwords that users have to supply before the Windows operating system permits them to reuse an old password. The default value is 24. Maximum Password Age Specifies how long a single password can be used before the Windows operating system forces the user to change it. The default value is 42 days. Minimum Password Age Specifies how long a single password must be used before the Windows operating system permits the user to change it. The default value is one day. Minimum Password Length Specifies the minimum number of characters the Windows operating system permits in user-supplied passwords. The default value is seven. Password Must Meet Complexity Requirements Specifies criteria for passwords, such as length of at least six characters; no duplication of all or part of the user s account name; and inclusion of characters from at least three of the follow ing four categories: uppercase letters, lowercase letters, numbers, and symbols. By default, the Windows operating system enables this policy. Store Passwords Using Reversible Encryption Specifies whether the Windows operating system should store user passwords in an encrypted form that specific applications or protocols can decrypt as needed. This policy weakens the security of the authentication system; you should not enable it unless you are forced to use an application or protocol that requires it. By default, this policy is disabled.
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8
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Planning a Secure Baseline Installation
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Account Lockout Threshold Specifies the number of failed logon attempts that causes the Windows operating system to lock out users from future attempts until an administrator resets the account. The default value is zero, which means that users are allowed unlimited failed logon attempts. Enforce User Logon Restrictions Specifies whether the Kerberos Key Distri bution Center (KDC) should validate every request for a session ticket against the user rights policy of the requesting user s account. By default, this policy is enabled. Maximum Lifetime For Service Ticket Specifies the amount of time that cli ents can use a Kerberos session ticket to access a particular service. The default value is 600 minutes. Maximum Lifetime For User Ticket Specifies the maximum amount of time that users can utilize a Kerberos ticket-granting ticket (TGT) before requesting a new one. The default value is ten hours. Maximum Lifetime For User Ticket Renewal Specifies the amount of time during which users can renew a Kerberos TGT. The default value is seven days. Maximum Tolerance For Computer Clock Synchronization Specifies the maximum time difference that Kerberos allows between the client computer and the authentication server. The default value is five minutes.
Tip Windows account policies have three possible states: enabled, disabled, and unde fined. The difference between disabled and undefined comes into play when multiple Group Policy Objects apply to the same objects and the Windows operating system must resolve policy conflicts. An enabled policy always overrides an undefined instance of the same policy, but a policy that is explicitly disabled might override an enabled instance of the same policy.
This default configuration forces users to change their passwords every six weeks, and compels them to use passwords that are not easy to guess. Policies like Minimum Password Age and Enforce Password History prevent the users from working around the password requirements by reusing the same few passwords and repeatedly changing passwords over a short time. If you want to increase the password security on your network, you can modify these defaults by requiring longer passwords and more frequent changes. You can also relax security by disabling some or all of these policies.
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