MBB Network Adapter Class Extension (MbbCx) Service Defaults in Windows 10

Windows Mobile Broadband Class Extension by Microsoft Corporation.

Default Settings

Startup type:Manual
Display name:MBB Network Adapter Class Extension
Service name:MbbCx
Service type:kernel
Error control:normal
Path:%SystemRoot%\system32\drivers\MbbCx.sys
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MbbCx

Default Behavior

MBB Network Adapter Class Extension is a kernel device driver. In Windows 10 it is starting only if the user, an application or another service starts it. If MBB Network Adapter Class Extension fails to start, the failure details are being recorded into Event Log. Then Windows 10 will start up and notify the user that the MbbCx service has failed to start due to the error.

Dependencies

MBB Network Adapter Class Extension cannot be started under any conditions, if the Network Adapter Wdf Class Extension Library service is disabled.

Restore Default Startup Configuration for MBB Network Adapter Class Extension

Before you begin doing this, make sure that all the services on which MBB Network Adapter Class Extension depends are configured by default and function properly. See the list of dependencies above.

1. Run the Command Prompt as an administrator.

2. Copy the command below, paste it into the command window and press ENTER:

sc config MbbCx start= demand

3. Close the command window and restart the computer.

The MbbCx service is using the MbbCx.sys file that is located in the %WinDir%\system32\drivers folder. If the file is changed, damaged or deleted, you can restore its original version from Windows 10 installation media.