Windows 10 Services

Ancillary Function Driver for Winsock - Windows 10 Service

Ancillary Function Driver for Winsock.

This service also exists in Windows 7, 8, Vista and XP.

Startup Type

Windows 10 version Home Pro Education Enterprise
1507 System System System System
1511 System System System System
1607 System System System System
1703 System System System System
1709 System System System System
1803 System System System System

Default Properties

Display name:Ancillary Function Driver for Winsock
Service name:AFD
Error control:normal

Default Behavior

The Ancillary Function Driver for Winsock service is a kernel mode driver. If Ancillary Function Driver for Winsock fails to start, the error is logged. Windows 10 startup proceeds, but a message box is displayed informing you that the AFD service has failed to start.


If Ancillary Function Driver for Winsock is stopped, the following services cannot start:

Restore Default Startup Type for Ancillary Function Driver for Winsock

Automated Restore

1. Select your Windows 10 edition and release, and then click on the Download button below.

2. Save the RestoreAncillaryFunctionDriverforWinsockWindows10.bat file to any folder on your hard drive.

3. Right-click the downloaded batch file and select Run as administrator.

4. Restart the computer to save changes.

Note. Make sure that the afd.sys file exists in the %WinDir%\system32\drivers folder. If this file is missing you can try to restore it from your Windows 10 installation media.