Hyper-V Time Synchronization Service (vmictimesync) Defaults in Windows 10

Synchronizes the system time of this virtual machine with the system time of the physical computer.

Default Settings

Startup type: Manual
Display name:Hyper-V Time Synchronization Service
Service name:vmictimesync
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\vmictimesync
  • SeChangeNotifyPrivilege
  • SeSystemtimePrivilege
  • SeCreateGlobalPrivilege

Default Behavior

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


Hyper-V Time Synchronization Service cannot be started under any conditions, if the Microsoft Hyper-V Guest Infrastructure Driver service is disabled.

Restore Default Startup Configuration of Hyper-V Time Synchronization Service

Before you begin doing this, make sure that all the services on which Hyper-V Time Synchronization Service 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 vmictimesync start= demand

3. Close the command window and restart the computer.

The vmictimesync service is using the icsvc.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.