Network Access Protection Agent (napagent) Service Defaults in Windows XP

Allows windows clients to participate in Network Access Protection.

The Network Access Protection Agent service exists only in:

Default Settings

Startup type: Manual
Display name:Network Access Protection Agent
Service name:napagent
Service type:share
Error control:normal
Path:%SystemRoot%\System32\svchost.exe -k netsvcs
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\napagent

Default Behavior

Network Access Protection Agent is a Win32 service. In Windows XP it won't start until the current user starts it. When the Network Access Protection Agent service is started, it is running as localSystem in a shared process of svchost.exe. Other services and drivers are allowed to run in the same process. If the Network Access Protection Agent fails to start, the technical information about the error is added to the Event Log. Windows XP startup should proceed, but a message box should be displayed informing the user that the napagent service has failed to start.


Network Access Protection Agent depends on the Remote Procedure Call (RPC) service.

Restore Default Startup Configuration of Network Access Protection Agent

Before you begin doing this, make sure that all the services on which Network Access Protection Agent depends are configured by default and function properly. See the list of dependencies above.

1. Run the Command Prompt.

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

sc config napagent start= demand

3. Close the command window and restart the computer.

The napagent service is using the qagentrt.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 XP installation media.