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 -p
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 of TCP/IP NetBIOS Helper

Before you begin doing this, make sure that all the services on which TCP/IP NetBIOS Helper 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 lmhosts start= demand

3. Close the command window and restart the computer.

The lmhosts service is using the lmhsvc.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 10 installation media.