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Organizations commonly implement a mix of directory service, server, and client platforms. In environments in which Windows 95, Windows 98, Windows Me, or Windows NT 4 participate in an Active Directory domain, administrators need to be aware of several issues.
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Passwords: Although Windows 2000, Windows XP Professional, and Windows Server 2003 support 127-character passwords, Windows 95, Windows 98, and Windows ME support only 14-character passwords. Active Directory Client: The Active Directory Client can be downloaded from Microsoft s Web site and installed on Windows 95, Windows 98, Windows Me, and Windows NT 4 systems. It enables those platforms running previous editions of Windows to participate in many Active Directory features available to Windows 2000 Professional or Windows XP Professional, including the following:
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Site-awareness: a system with the Active Directory Client will attempt to log on to a domain controller in its site, rather than to any domain controller in the enterprise. Active Directory Service Interfaces (ADSI): use scripting to manage Active Directory.
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Distributed File System (DFS): access DFS shared resources on servers running Windows 2000 and Windows Server 2003. NT LAN Manager (NTLM) version 2 authentication: use the improved authentication features in NTLM version 2. Active Directory Windows Address Book (WAB): property pages Active Directory search capability integrated into the Start Find or Start Search commands.
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The following functionalities, supported on Windows 2000 Professional and Windows XP Professional, are not provided by the Active Directory client on Windows 95, Windows 98, and Windows NT 4:
Kerberos V5 authentication Group Policy or Change and Configuration Management support Service principal name (SPN), or mutual authentication.
In addition, you should be aware of the following issues in mixed environments:
Without the Active Directory client, users on systems using versions of Windows earlier than Windows 2000 can change their password only if the system has access to the domain controller performing the single master operation called primary domain controller (PDC) emulator. To determine which system is the PDC emulator in a domain, open Active Directory Users And Computers, select the domain node, choose the Operations Masters command from the Action menu, and then click the PDC tab. If the PDC emulator is unavailable (that is, if it is offline or on the distant side of a downed network connection), the user cannot change his or her password. As you have learned in this chapter, user objects maintain two user logon name properties. The Pre-Windows 2000 logon name, or SAM name, is equivalent to the user name in Windows 95, Windows 98, or Windows NT 4. When users log on, they enter their user name and must select the domain from the Log On To box. In other situations, the user name may be entered in the format <DomainName> \<UserLogonName>.
Users logging on using Windows 2000 or later platforms may log on the same way, or they may log on using the more efficient UPN. The UPN takes the format <UserLogon Name>@<UPN Suffix>, where the UPN suffix is, by default, the DNS domain name in which the user object resides. It is not necessary to select the domain from the Log On To box when using UPN logon. In fact, the box becomes disabled as soon as you type the @ symbol.
Lesson 4
Securing and Troubleshooting Authentication
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Auditing Authentication
If you are concerned that attacks might be taking place to discover user passwords, or to troubleshoot authentication problems, you can configure an auditing policy that will create entries in the Security log that might prove illuminating.
Audit Policies
The following policies are located in the Computer Configuration, Windows Settings, Security Settings, Local Policies, Audit Policy node of Group Policy Object Editor (or the Local Security Policy snap-in). You can configure auditing for successful or failed events.
Audit Account Management Configures auditing of activities, including the creation, deletion, or modification of user, group, or computer accounts. Password resets are also logged when account management auditing is enabled. Audit Account Logon Events This policy audits each instance of user logon that involves domain controller authentication. For domain controllers, this policy is defined in the Default Domain Controllers GPO. Note, first, that this policy will create a Security log entry on a domain controller each time a user logs on interactively or over the network using a domain account. Second, remember that to evaluate fully the results of the auditing, you must examine the Security logs on all domain controllers because user authentication is distributed among each domain controller in a site or domain. Audit Logon Events Logon events include logon and logoff, interactively or through network connection. Account logon events are generated on the local computer for local accounts and on the domain controller for network accounts, whereas logon events are generated wherever the logon occurs. If you have enabled Audit Logon Events policy for successes on a domain controller, workstation logons will not generate logon audits. Only interactive and network logons to the domain controller itself generate logon events.
Keep track of the distinction between Account Logon and Logon events. When a user logs on to his or her workstation using a domain account, the workstation registers a Logon event and the domain controller registers an Account Logon event. When the user connects to a network server s shared folder, the server registers a Logon event and the domain controller registers an Account Logon event.
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