IP Network Address Translator (IpNat) Service Defaults in Windows XP

IP Network Address Translator.

Default Settings

Startup type:Manual
Display name:IP Network Address Translator
Service name:IpNat
Service type:kernel
Error control:normal
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\IpNat

Default Behavior

IP Network Address Translator is a kernel device driver. In Windows XP it won't start until the current user starts it. If the IP Network Address Translator 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 IpNat service has failed to start.


IP Network Address Translator depends on the TCP/IP Protocol Driver service.

Restore Default Startup Configuration for IP Network Address Translator

1. Select your Windows XP edition and service pack, and then click Download.

2. Save the WinXP_IpNat_Service_Startup.cmd file to a local storage device.

3. Run the saved file.

4. Restart the computer.

The IpNat service is using the ipnat.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 XP installation media.