This service also exists in Windows 10.
Windows 11 version | Home | Pro | Education | Enterprise |
---|---|---|---|---|
21H2 | Manual | Manual | Manual | Manual |
22H2 | Manual | Manual | Manual | Manual |
23H2 | Manual | Manual | Manual | Manual |
Display name: | MBB Network Adapter Class Extension |
Service name: | MbbCx |
Type: | kernel |
Path: | %WinDir%\system32\drivers\MbbCx.sys |
Error control: | normal |
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.
MBB Network Adapter Class Extension is unable to start, if the Network Adapter Wdf Class Extension Library service is stopped or disabled.
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.