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Close the Group Policy Object Editor window. Click OK to close the Properties dialog box for the contoso. Select the Domain Controllers container, under the domain node. From the Action menu, click Properties.
Double-click the Audit Account Logon Events policy. Double-click the Audit Logon Events policy. Double-click the Audit Account Management policy. Generate two logon failure events by attempting to log on twice with the username sbishop and an invalid password. In the tree pane, navigate to and select the Employees OU. Enter and confirm a new password for Scott Bishop, and then click OK. Open the Computer Management console from the Administrative Tools group.
Expand Event Viewer and select Security. Make sure the Category column is wide enough that you can identify the types of events that are logged. Explore the events that have been generated by recent activity.
Securing Authentication with Policy Active Directory on Windows Server supports security policies to strengthen passwords and their use within an enterprise. Password Policy The domain password policies enable you to protect your network against password compromise by enforcing best-practice password management techniques.
Table 1. When this policy is enabled, Active Directory maintains a list of recently used passwords, and will not allow a user to create a password that matches a password in that history.
The result is that a user, when prompted to change his or her password, cannot use the same password again, and therefore cannot circumvent the password lifetime. The policy is enabled by default, with the maximum value of Many IT organizations use a value of 6 to Maximum Password Age. This policy determines when users will be forced to change their passwords.
Passwords that are unchanged or infrequently changed are more vulnerable to being cracked and utilized by attackers to impersonate a valid account. The default value is 42 days. IT organizations typically enforce password changes every 30 to 90 days.
Minimum Password Age. When users are required to change their passwords—even when a password history is enforced—they can simply change their passwords several times in a row to circumvent password requirements and return to their original passwords.
The Minimum Password Age policy prevents this possibility by requiring that a specified number of days must pass between password changes. Of course, a password can be reset at any time in Active Directory by an administrator or support person with sufficient permissions. But the user cannot change their password more than once during the time period specified by this setting.
Minimum Password Length. This policy specifies the minimum number of characters required in a password. The default in Windows Server is seven. Passwords Must Meet Complexity Requirements. This policy enforces rules, or filters, on new passwords. The default password filter in Windows Server passfilt. Is at least six characters long. Contains characters from three of the following four character types: Uppercase alphabet characters A Z Lowercase alphabet characters a Account Lockout Threshold.
This policy configures the number of invalid logon attempts that will trigger account lockout. The value can be in the range of 0 to A value that is too low as few as three, for example may cause lockouts due to normal, human error at logon. A value of 0 will result in accounts never being locked out.
The lockout counter is not affected by logons to locked workstations. Account Lockout Duration. The policy is not set by default, as it is useful only in conjunction with the Account Lockout Threshold policy. Although the policy accepts values ranging from 0 to minutes, or about 10 weeks, a low setting 5 to 15 minutes is sufficient to reduce attacks significantly without unreasonably affecting legitimate users who are mistakenly locked out.
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