Join and Authentication Issues

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Repairing a Domain Controller

To repair a failed Windows 2000 Server domain controller there are several options available to you. You might need to use one or all of the following methods to repair a failed domain controller:

For more information about installing and removing Active Directory with the Active Directory Installation Wizard (Dcpromo tool), see "Active Directory Data Storage" in this book. For more information about the Ntdsutil tool, see "Active Directory Diagnostic Tool (Ntdsutil.exe)" in this book.

Repairing a Windows NT 4.0–based Backup Domain Controller

Recovering a lost backup domain controller account becomes important when you are running Windows NT 4.0 in a mixed mode environment. It's important to know how to recover if the computer account for a Windows NT 4.0–based backup domain controller becomes corrupt or is accidentally deleted.


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Note

If the computer account for a backup domain controller in a mixed-mode domain gets deleted, you can use the dsacls command.

To repair a backup domain account

  1. On the orphaned backup domain controller, log on locally by using an account with administrator privileges.
  2. Start Server Manager.

    From the Start menu, click Run, and then type:

    svrmgr

    Server Manager for Windows NT 4.0 or for Windows NT 3.x is displayed.

  3. Re-create the account for the backup domain controller. (This actually happens on the primary domain controller.)
  4. Use the force sync command to reset the password properly.

Recovering from a Deleted Windows 2000 Computer and Domain Account

event id 26 application pop-up


Application popup: lsass.exe - System Error : Security Accounts Manager initialization failed because of the following error: No mapping between account names and security IDs was done.  Error Status: 0xc0000073. Please click OK to shutdown this system and reboot into Directory Services Restore Mode, check the event log for more detailed information.


The problem is that if you delete a computer account, you need to wait for the delete to replicate to all domain controllers in the domain, before doing anything further with the computer, such as joining or running the Active Directory Installation Wizard. Otherwise, the join process and Active Directory Installation Wizard re-uses the existing account and then the delete replicates in causing start or logon failures.

The solution to the computer account problem differs for clients, servers, and domain controllers:

The following is a typical scenario:

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