Link-Layer Topology Discovery Mapper (lltdsvc) Service Defaults in Windows 8

Creates a Network Map, consisting of PC and device topology (connectivity) information, and metadata describing each PC and device. If this service is disabled, the Network Map will not function properly.

Default Settings

Startup type:Manual
Display name:Link-Layer Topology Discovery Mapper
Service name:lltdsvc
Service type:share
Error control:normal
Object:NT AUTHORITY\LocalService
Path:%SystemRoot%\System32\svchost.exe -k LocalService
File:%SystemRoot%\System32\lltdsvc.dll
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\lltdsvc
Privileges:
  • SeImpersonatePrivilege
  • SeChangeNotifyPrivilege

Default Behavior

Link-Layer Topology Discovery Mapper is a Win32 service. In Windows 8 it will not be started until the user starts it. When the Link-Layer Topology Discovery Mapper service is started, it runs as NT AUTHORITY\LocalService in a process of svchost.exe, sharing it with other services. If Link-Layer Topology Discovery Mapper fails to start, the error details are added to Windows 8 error log. When the operating system startup is complete, the user is being notified that the lltdsvc service hasn't been started.

Dependencies

Link-Layer Topology Discovery Mapper can't start, if any service from the list below is disabled or not available:

Restore Default Startup Configuration for Link-Layer Topology Discovery Mapper

Before you begin doing this, make sure that all the services on which Link-Layer Topology Discovery Mapper 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 lltdsvc start= demand

3. Close the command window and restart the computer.

The lltdsvc service is using the lltdsvc.dll file that is located in the %WinDir%\System32 folder. If the file is corrupted or deleted, you can put it back in there.