TCP/IP NetBIOS Helper (lmhosts) Service Defaults in Windows 10

Provides support for the NetBIOS over TCP/IP (NetBT) service and NetBIOS name resolution for clients on the network, therefore enabling users to share files, print, and log on to the network. If this service is stopped, these functions might be unavailable. If this service is disabled, any services that explicitly depend on it will fail to start.

Default Settings

Startup type:Manual
Display name:TCP/IP NetBIOS Helper
Service name:lmhosts
Service type:share
Error control:normal
Object:NT AUTHORITY\LocalService
Path:%SystemRoot%\System32\svchost.exe -k LocalServiceNetworkRestricted
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\lmhosts
  • SeCreateGlobalPrivilege

Default Behavior

TCP/IP NetBIOS Helper is a Win32 service. In Windows 10 it is starting only if the user, an application or another service starts it. When the TCP/IP NetBIOS Helper service is started, it is running as NT AUTHORITY\LocalService in a shared process of svchost.exe along with other services. If TCP/IP NetBIOS Helper fails to start, the failure details are being recorded into Event Log. Then Windows 10 will start up and notify the user that the lmhosts service has failed to start due to the error.


TCP/IP NetBIOS Helper cannot be started under any conditions, if the Ancillary Function Driver for Winsock service is disabled.

Restore Default Startup Configuration for TCP/IP NetBIOS Helper

1. Select your Windows 10 edition and release, and then click Download.

2. Save the Win10_lmhosts_Service_Startup.cmd file to a local storage device.

3. Run the saved file as an administrator.

4. Restart the computer.

The lmhosts service is using the lmhsvc.dll file that is located in the %WinDir%\System32 folder. If the file is changed, damaged or deleted, you can restore its original version from Windows 10 installation media.