IP Network Address Translator (IPNAT) Service Defaults in Windows 7

IP Network Address Translator by Microsoft Corporation.

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 7 it won't be started if the user doesn't start it. If IP Network Address Translator fails to start, Windows 7 attempts to write the failure details into Event Log. Then Windows 7 startup should proceed and the user should be notified that the IPNAT service is not running because of the error.


IP Network Address Translator is unable to start, if the TCP/IP Protocol Driver service is stopped or disabled.

Restore Default Startup Configuration for IP Network Address Translator

1. Select your Windows 7 edition and service pack, and then click Download.

2. Save the Win7_IPNAT_Service_Startup.cmd file to a local storage device.

3. Run the saved file as an administrator.

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 7 installation media.