PnP-X IP Bus Enumerator (IPBusEnum) Service Defaults in Windows 7

The PnP-X bus enumerator service manages the virtual network bus. It discovers network connected devices using the SSDP/WS discovery protocols and gives them presence in PnP. If this service is stopped or disabled, presence of NCD devices will not be maintained in PnP. All pnpx based scenarios will stop functioning.

Default Settings

Startup type: Manual
Display name:PnP-X IP Bus Enumerator
Service name:IPBusEnum
Service type:share
Error control:normal
Path:%SystemRoot%\system32\svchost.exe -k LocalSystemNetworkRestricted
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\IPBusEnum
  • SeChangeNotifyPrivilege
  • SeCreateGlobalPrivilege
  • SeImpersonatePrivilege
  • SeLoadDriverPrivilege

Default Behavior

PnP-X IP Bus Enumerator is a Win32 service. In Windows 7 it won't be started if the user doesn't start it. When the PnP-X IP Bus Enumerator service is started, it is running as LocalSystem in a shared process of svchost.exe. Other system components, such as drivers and services, may run in the same process. If PnP-X IP Bus Enumerator fails to start, Windows 7 attempts to write the failure details into Event Log. Then Windows 7 startup should proceed and the user should be notified that the IPBusEnum service is not running because of the error.


PnP-X IP Bus Enumerator is unable to start, if at least one of the following services is stopped or disabled:

If PnP-X IP Bus Enumerator is stopped, the Media Center Extender Service fails to start and initialize.

Restore Default Startup Configuration of PnP-X IP Bus Enumerator

Before you begin doing this, make sure that all the services on which PnP-X IP Bus Enumerator 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 IPBusEnum start= demand

3. Close the command window and restart the computer.

The IPBusEnum service is using the ipbusenum.dll file that is located in the C:\Windows\system32 directory. If the file is removed or corrupted, read this article to restore its original version from Windows 7 installation media.