Managing Active Directory and Advanced Concepts in VS .NET

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12 Managing Active Directory and Advanced Concepts
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FIGURE 12-36 Press Enter to enable DSRM after selecting the menu option
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FIGURE 12-37 The \ tells the system to use the local account database for logon You can now restore the system state backup Remember that DSRM command that you didn t run to delete the entire Justice League OU You
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ran it just before the reboot, so now the OU and all the users and groups in it are gone To check the backups available on a backup target, use this command:
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Wbadmin get versions -backuptarget:<drive>: -machine:<server name>
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Figure 12-38 shows a single backup available, and it is a system state backup
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FIGURE 12-38 One system state backup is available on the E: drive To restore from the system state backup, use the following command:
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Wbadmin start systemstaterecovery -version:09/30/2007-20:53 -backuptarget:e: -machine:savdaldc01
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You are noti ed that the replication engine was Distributed File System Replication (DFSR) or NTFRS and that the technology has changed since the system state backup, so you shouldn t use a system state backup At this point, if this was a nonauthoritative restore, just reboot the server However, when you perform replication with other servers, anything restored is overwritten if newer versions exist, deleting any objects you ve just restored The next step is to set the objects you want to bring back from the authoritative backup, and use ntdsutil First, activate the NTDS instance and then select the authoritative restore mode At this point, to mark the entire database as authoritative, issue the following command:
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authoritative restore: restore database
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12 MANAGING ACTIVE DIRECTORY AND ADVANCED CONCEPTS
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You can mark only a certain object as authoritative; for example, you could mark an OU, or you could also do an individual user or group The following is an example:
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authoritative restore: restore subtree <distinguished name of subtree, eg ou=justice league,dc=virt,dc=savilltech,dc=net >
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12 Managing Active Directory and Advanced Concepts
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Quit ntdsutil after con rming that you want to perform the authoritative restore (see Figure 12-39)
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FIGURE 12-39 Con rm whether to perform an authoritative restore Notice that Figure 12-40 provides information at the end regarding back-links Back-links are important relationships between objects if some groups are of the Windows 2000 type, which don t use LVR The LDIF le created needs to be run on a domain controller in each domain in the forest, using the following command:
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ldifde -i -k -f <generated ldf le>
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FIGURE 12-40 Information is given at the end of an authoritative restore When all objects are marked as authoritative, reboot the server normally When replication has taken place, the objects are available again
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Displaying Last Logon Information
One of the new features of Windows Server 2008 that is enabled when Windows Server 2008 domain mode is enabled is Last Interactive Logon Information, which goes beyond what was available in previous versions of Windows While Windows 2000 AD had a lastLogon attribute, that value was not replicated between the domain controllers within a domain, and to check the last time a user logged on, you had to query every domain controller in the domain and use the latest date/time Windows Server 2003 provided the lastLogonTimestamp attribute, which was replicated between domain controllers but only every 14 days, so it was not useful for accurate information The lastLogonTimestamp attribute was designed to identify stale accounts that had not been used for a long time With Windows Server 2008, you now have multiple values that are replicated between domain controllers per the normal Windows replication cycles and that give you not just the last time you logged on but also information on failed logon attempts, which is obviously important information for a user to see and report on if he did not personally experience the failed logons Find this setting by navigating Computer Con guration, Policies, Administrative Templates, Windows Components, Windows Logon Options and enabling the Display Information About Previous Logons During User Logon, as shown in Figure 12-41 This setting must be applied to both domain controllers and the client machines for which you want to display last logon information If you enable only for the computers and not the domain controllers, clients receive an error that last logon information is not available and are not able to log in The rst time a user logs on after you enable this policy, she is noti ed that it is the rst time she has interactively logged on with the account On subsequent logons, the user sees more detailed information, as shown in Figure 12-42