Network Adapters Are Missing or Incorrect in Device Manager After You Run NTBackup to Restore System State Data

After you run the NTBackup utility (Ntbackup.exe) to fully restore the System State data, network adapters may be missing or have incorrect names in Device Manager. New wide area network (WAN) miniports (Layer 2 Tunneling Protocol [L2TP]) that were not present before you ran the restore operation may now be present. You may not be able to remove the new adaptors that appear in Device Manager and reinstall the missing ones.

This problem occurs because only part of the Plug and Play database is being restored. Therefore, the Plug and Play database is in an inconsistent state.

To restore the System State data in future backups so that devices work properly, follow these steps.

NOTE: You must also apply this change to the Windows 2000 installation that will host the Ntbackup.exe restore process. Backups of System State data that are run before making this change will continue to cause the symptoms that are described in this article.

1. Start Registry Editor.
2. Locate and then click the following subkey:
   
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\BackupRestore\KeysNotToRestore
3. Right-click the Plug & Play entry, and then click Modify.
4. In the Value Data box, change the text from
   CurrentControlSet\Enum
   CurrentControlSet\Control\CriticalDeviceDatabase
   to
   CurrentControlSet\Control\CriticalDeviceDatabase

Service Pack Information

To resolve this problem, obtain the latest service pack for Microsoft Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

Hotfix Information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Microsoft Windows 2000 Service Pack 4.

For additional information about how to obtain a hotfix for Windows 2000 Datacenter Server, click the article number below to view the article in the Microsoft Knowledge Base: For additional information about how to install multiple hotfixes with only one reboot, click the article number below to view the article in the Microsoft Knowledge Base: