Secondary Logon (seclogon) Service Defaults in Windows 10

Enables starting processes under alternate credentials. If this service is stopped, this type of logon access will 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:Secondary Logon
Service name:seclogon
Service type:share
Error control:normal
Object:LocalSystem
Path:%SystemRoot%\system32\svchost.exe -k netsvcs
File:%SystemRoot%\system32\seclogon.dll
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\seclogon
Privileges:
  • SeTcbPrivilege
  • SeRestorePrivilege
  • SeBackupPrivilege
  • SeAssignPrimaryTokenPrivilege
  • SeIncreaseQuotaPrivilege
  • SeImpersonatePrivilege

Default Behavior

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

Restore Default Startup Configuration for Secondary Logon

1. Run the Command Prompt as an administrator.

2. Copy the command below, paste it into the command window and press ENTER:

sc config seclogon start= demand

3. Close the command window and restart the computer.

The seclogon service is using the seclogon.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.