CoreMessaging (CoreMessagingRegistrar) Service Defaults in Windows 10

Manages communication between system components.

Default Settings

Startup type: Automatic
Display name:CoreMessaging
Service name:CoreMessagingRegistrar
Service type:share
Error control:normal
Object:NT AUTHORITY\LocalService
Path:%SystemRoot%\system32\svchost.exe -k LocalServiceNoNetwork -p
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\CoreMessagingRegistrar

Default Behavior

CoreMessaging is a Win32 service. In Windows 10 it is starting automatically when the operating system starts. Then the CoreMessaging service is running as NT AUTHORITY\LocalService in a shared process of svchost.exe along with other services. If CoreMessaging fails to start, the failure details are being recorded into Event Log. Then Windows 10 will start up and notify the user that the CoreMessagingRegistrar service has failed to start due to the error.


CoreMessaging cannot be started under any conditions, if the Remote Procedure Call (RPC) service is disabled.

Restore Default Startup Configuration of CoreMessaging

Before you begin doing this, make sure that all the services on which CoreMessaging 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 commands below, paste them into the command window and press ENTER:

sc config CoreMessagingRegistrar start= auto
sc start CoreMessagingRegistrar

3. Close the command window and restart the computer.

The CoreMessagingRegistrar service is using the coremessaging.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.