qr code generator in c#.net Part 8: Windows Server 2003 Disaster Planning and Recovery in Visual C#.NET

Creation QR Code JIS X 0510 in Visual C#.NET Part 8: Windows Server 2003 Disaster Planning and Recovery

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Part 8: Windows Server 2003 Disaster Planning and Recovery
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Microsoft Windows Server 2003 Inside Out When performing authoritative restores, there are several significant issues that you should consider. The first and most important issue has to do with passwords used for computers and Windows NT LAN Manager (NTLM) trusts. These passwords are changed automatically every seven days. If you perform an authoritative restore of Active Directory, the restored data will contain the passwords that were in use when the backup archive was made. If you monitor the event logs after the restore, you may see related events or you may hear from users who are experiencing problems accessing resources in the domain. Computer account passwords allow computers to authenticate themselves in a domain using a computer trust. If a computer password has changed, the computer may not be able to reauthenticate itself in the domain. In this case, you may need to reset the computer account password by right-clicking on the computer account in Active Directory Users And Computers, and then selecting Reset Account. If the reset of the password doesn t work, you may need to remove the computer account from the domain, and then add it back. NTLM trusts are trusts between Active Directory domains and Microsoft Windows NT domains. If a trust password has changed, the trust between the domains may fail. In this case, you may need to delete the trust, and then recreate it as discussed in the section entitled Establishing External, Shortcut, Realm, and Cross-Forest Trusts, on page 1131. Another significant issue when performing an authoritative restore has to do with group membership. Problems with group membership can occur after an authoritative restore for several reasons. In the first case, an administrator has updated a group object s membership on a domain controller that has not yet received the restored data. In this case, the domain controller may replicate the changes to other domain controllers, causing a temporary inconsistency. The changes shouldn t be permanent, however, because when you perform an authoritative restore, the update sequence number (USN) of all restored objects is incremented by 100,000. This ensures that the restored data is authoritative and overwrites any existing data. Another problem with group membership can occur if group objects contain user accounts that do not currently exist in the domain. In this case, if group objects are replicated before these user objects are, the user accounts that do not currently exist in the domain will be seen as invalid user accounts. As a result, the user accounts will be deleted as group members. When the user accounts are later replicated, the user accounts will not be added back to the groups. Although there is no way to control which objects are replicated first, there is a way to correct this problem. You must force the domain controller to replicate the group membership list with the group object. You can do this by creating a temporary user account and adding it to each group that contains user accounts that are currently not valid in the domain. Here s how this would work: You authoritatively restore and then restart the domain controller. The domain controller begins replicating its data to other domain controllers. When this initial replication process finishes, you create a temporary user account and add it to the requisite
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Backup and Recovery groups. The group membership list will then be replicated. If any domain controller has removed previously invalid user accounts as members of these groups, the domain controller will then return the user accounts to the group. You can perform an authoritative restore by completing the following steps:
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1 Follow steps 1 through 6 in the section entitled Performing a Nonauthoritative Restore of Active Directory, but do not restart the computer when the restore is complete. 2 Click Start, click Run, type cmd in the Open field, and then click OK. 3 At the command prompt, type ntdsutil. This starts the Directory Services Management Tool. 4 At the Ntdsutil prompt, type authoritative restore. You should now be at the Authoritative Restore prompt, where you have the following options: You can authoritatively restore the entire Active Directory database by typing restore database. If you restore the entire Active Directory database, there will be a significant amount of replication traffic generated throughout the domain and the forest. You should restore the entire database only if Active Directory has been corrupted or there is some other significant reason for doing so. You can authoritatively restore a container and all its related objects (referred to as a subtree) by typing restore subtree ObjectDN where ObjectDN is the distinguished name of the container to restore. For example, if someone accidentally deleted the Marketing OU in the cpandl.com domain, you could restore the OU and all the objects it contained by typing the command restore subtree ou=marketing,dc=cpandl,dc=com. You can authoritatively restore an individual object by typing restore object ObjectDN where ObjectDN is the distinguished name of the object to restore. For example, if someone accidentally deleted the Sales group from the default container for users and groups (cn=users) in the cpandl.com domain, you could restore the group by typing the command restore object cn=sales,cn=users,dc=cpandl,dc=com. 5 When you type a restore command and press Enter, the Authoritative Restore Confirmation dialog box appears, which prompts you to click Yes if you re sure you want to perform the restore action. Click Yes to perform the restore operation. 6 Type quit twice to exit Ntdsutil, and then restart the server.
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