MBB Network Adapter Class Extension - Windows 11 Service
This service also exists in Windows 10.
Startup Type
| Windows 11 version | Home | Pro | Education | Enterprise |
|---|---|---|---|---|
| 21H2 | Manual | Manual | Manual | Manual |
| 22H2 | Manual | Manual | Manual | Manual |
| 23H2 | Manual | Manual | Manual | Manual |
| 24H2 | Manual | Manual | Manual | Manual |
Default Properties
| Display name: | MBB Network Adapter Class Extension |
| Service name: | MbbCx |
| Type: | kernel |
| Path: | %WinDir%\system32\drivers\MbbCx.sys |
| Error control: | normal |
Default Behavior
The MBB Network Adapter Class Extension service is a kernel mode driver. If MBB Network Adapter Class Extension fails to start, the error is logged. Windows 11 startup proceeds, but a message box is displayed informing you that the MbbCx service has failed to start.
Dependencies
MBB Network Adapter Class Extension is unable to start, if the Network Adapter WDF Class Extension Library service is stopped or disabled.
Restore Default Startup Type for MBB Network Adapter Class Extension
Automated Restore
1. Select your Windows 11 edition and release, and then click on the Download button below.
2. Save the RestoreMBBNetworkAdapterClassExtensionWindows11.bat file to any folder on a local drive such as SSD or a hard disk.
3. Right-click the downloaded batch file and select Properties.
4. Check the Unblock checkbox and click OK.
5. Right-click the batch file again and select Run as administrator.
6. Restart the computer to save changes.
Note. Make sure that the MbbCx.sys file exists in the %WinDir%\system32\drivers folder. If this file is missing you can try to restore it from your Windows 11 installation media.