Ancillary Function Driver for Winsock (AFD) Service Defaults in Windows 10

Ancillary Function Driver for Winsock.

Default Settings

Startup type:System
Display name:Ancillary Function Driver for Winsock
Service name:AFD
Service type:kernel
Error control:normal
Group:PNP_TDI
Path:%SystemRoot%\system32\drivers\afd.sys
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\AFD

Default Behavior

Ancillary Function Driver for Winsock is a kernel device driver. In Windows 10 it is starting at Kernel initialization. If Ancillary Function Driver for Winsock fails to start, the failure details are being recorded into Event Log. Then Windows 10 will start up and notify the user that the AFD service has failed to start due to the error.

Dependencies

While Ancillary Function Driver for Winsock is stopped, disabled or working incorrectly, the following services do not start:

Restore Default Startup Configuration for Ancillary Function Driver for Winsock

1. Run the Command Prompt as an administrator.

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

sc config AFD start= system
sc start AFD

3. Close the command window and restart the computer.

The AFD service is using the afd.sys file that is located in the %WinDir%\system32\drivers folder. If the file is changed, damaged or deleted, you can restore its original version from Windows 10 installation media.