ean 128 barcode vb.net Lesson 3: Supporting Computer Objects and Accounts in VS .NET

Creation Code-128 in VS .NET Lesson 3: Supporting Computer Objects and Accounts

Lesson 3: Supporting Computer Objects and Accounts
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An error message indicating a failed secure channel
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Error messages or events in the event log indicating similar problems or suggesting that passwords, trusts, secure channels, or relationships with the domain or a domain controller have failed. One such error is NETLOGON Event ID 3210: Failed To Authenticate, which appears in the computer's event log. A computer account is missing in Active Directory.
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Resetting a Computer Account
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When the secure channel fails, you must reset it. Many administrators do so by removing the computer from the domain, putting it in a workgroup, and then rejoining the domain. This is not a good practice because it has the potential to delete the computer account altogether, which loses the computer s SID and, more important, its group memberships. When you rejoin the domain, even though the computer has the same name, the account has a new SID, and all the group memberships of the previous computer object must be re-created.
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Do not remove a computer from the domain and rejoin it
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If the trust with the domain has been lost, do not remove a computer from the domain and rejoin it. Instead, reset the secure channel.
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To reset the secure channel between a domain member and the domain, use the Active Directory Users and Computers snap-in, Dsmod.exe, Netdom.exe, or Nltest.exe. By resetting the account, the computer s SID remains the same and it maintains its group memberships.
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The Active Directory Users and Computers snap-in Right-click a computer and choose Reset Account. Click Yes to confirm your choice. The computer will then need to be rejoined to the domain, requiring a reboot. Dsmod Type the command, dsmod computer "Computer DN" reset. You will have to rejoin the computer to the domain and reboot the computer. Netdom Type the command netdom reset MachineName /domain DomainName / UserO UserName /PasswordO {Password | *} where the credentials belong to the local Administrators group of the computer. This command resets the secure channel by
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Computers
attempting to reset the password on both the computer and the domain, so it does not require rejoining or rebooting. Nltest On the computer that has lost its trust, type the command nltest /server:Server Name /sc_reset:DOMAIN\DomainController, for example, nltest /server:SERVER02 / sc_reset:CONTOSO\SERVER01. This command, like Netdom.exe, attempts to reset the secure channel by resetting the password both on the computer and in the domain, so it does not require rejoining or rebooting. Because Nltest.exe and Netdom.exe reset the secure channel without requiring a reboot, try those commands first. Only if not successful should you use the Reset Account command or Dsmod to reset the computer account.
Quick Check
A user complains that when she attempts to log on, she receives an error message indicating the trust with the domain has been lost. You want to attempt to reset the secure channel without rebooting her system. Which two commands can you use
Quick Check Answer The Netdom.exe and Nltest.exe commands reset the secure channel without requiring you to rejoin the computer to the domain and, therefore, they require no reboot.
Renaming a Computer
When you rename a computer, you must be careful to do it correctly. Remember that the computer uses its name to authenticate with the domain, so if you rename only the domain object, or only the computer itself, they will be out of synch. You must rename the computer in such a way that both the computer and the domain object are changed. You can rename a computer correctly by logging on to the computer itself, either locally or with a remote desktop session. Open the System properties from Control Panel and, in the Computer Name, Domain, And Workgroup Settings section, click Change Settings. Click Continue if prompted, and then click the Change button on the Computer Name tab. From the command prompt, you can use the Netdom command with the following syntax:
netdom renamecomputer MachineName /NewName:NewName [/UserO:LocalUsername] [/PasswordO:{LocalPassword|*} ] [/UserD:DomainUsername] [/PasswordD:{DomainPassword|*} ] [/SecurePasswordPrompt] [/REBoot[:TimeInSeconds]]
In addition to specifying the computer to rename (MachineName) and the desired new name (NewName), you must have credentials that are a member of the local Administrators group on the computer and credentials that have permission to rename the domain computer object. By
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