Application Layer Gateway Service (ALG) Defaults in Windows 11
Provides support for 3rd party protocol plug-ins for Internet Connection Sharing.
Default Settings
| Startup type: | Manual |
| Display name: | Application Layer Gateway Service |
| Service name: | ALG |
| Service type: | own |
| Error control: | normal |
| Object: | NT AUTHORITY\LocalService |
| Path: | %SystemRoot%\System32\alg.exe |
| Registry key: | HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ALG |
| Privileges: |
|
Default Behavior
Application Layer Gateway Service is a Win32 service. In Windows 11 it starts only if the user, an application or another service starts it. When the Application Layer Gateway Service is started, it logs on as NT AUTHORITY\LocalService and running in its own process of alg.exe. If Application Layer Gateway Service fails to start, the failure details will be recorded into Event Log. Then Windows 11 should boot up and notify the user about the ALG service startup failure.
Restore Default Startup Configuration of Application Layer Gateway Service
1. Run the Command Prompt as an administrator.
2. Copy the command below, paste it into the command window and press ENTER:
sc config ALG start= demand
3. Close the command window and restart the computer.
The ALG service is using the alg.exe 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 11 installation media.