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Error Code 31 in Device Manager for WAN Miniport (Network monitor) Device on Microsoft Windows 8 or Windows Server 2012

Device Manager displays a Yellow Exclamation mark next to the WAN Miniport (Network monitor) Device. The Details tab of the device properties window includes the error code 31 and the following message:

"The device is not working properly because Windows cannot load the drivers required for this device. (Code 31)."

The error occurs because Windows was not able to load the drivers required for the WAN (Network monitor) device. Because there is no driver associated with the device, it cannot be removed from Device Manager.

Affected configurations

The following configurations may be affected by this symptom:

  • ThinkCentre
  • ThinkStation
  • ThinkServer
  • ThinkPad
  • Idea Tablet
  • IdeaPad
  • IdeaCentre

Affected Systems

  • All

Operating Systems

  • Microsoft Windows 8
  • Microsoft Windows Server 2012

To prevent the issue from occurring on future installs, the hotfix from KB Article 2822241 must be integrated into the install media that is used during setup.  For information about how to use DISM to integrate a hotfix package into install media, see the following TechNet article at the following URL:

Microsoft has provided an automated solution at the web page located under the “Additional Information” section.  To manually correct the error, please follow these instructions.

Microsoft has provided an automated solution at the web page located under the “Additional Information” section.  To manually correct the error, please follow these instructions.

If the user has already installed the operating system and are currently receiving error code 31 on the WAN Miniport (Network Monitor) Device, the user can eliminate the error by completing the following steps:

  1. Open Device Manager.
  2. Right-click on the WAN miniport (Network monitor) device and select Update Driver Software.
  3. Select Browse my computer for driver software.
  4. Select Let me pick from a list of device drivers on my computer.
  5. Uncheck Show compatible hardware.
  6. In the left column select Microsoft, in the right column select Microsoft KM-TEST Loopback Adapter.
  7. At the Update Driver Warning dialog box, select Yes to continue installing this driver.
  8. Once the driver is installed, right-click the device and select Uninstall.
  9. Once the device is uninstalled, right-click the computer name in Device Manager and select Scan for hardware changes.
  10. From View (on the menu bar), select Show Hidden Devices.
  11. The WAN Miniport (Network monitor) will be started and will no longer appear with a Yellow Exclamation mark.


Additional Information

See Microsoft Article 2871372 for more information at the following URL:

If you are unable to find what you are looking for, please do try the following options:
1. Lenovo Assisted Search
2. Product usage and general troubleshooting tips
3. Lenovo Support Forum
4. Technical Support Call Centre

Country Availability
Alias ID : SF13-D0149
Document ID : HT078644
Legacy Document ID : SF13-D0149
Last Updated : 12 Mar 2014
Copyright © Lenovo 2013, all rights reserved
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