Registrations are now open. Join us today!
There is still a lot of work to do on the wiki yet! More information about editing can be found here.
Already have an account?

Microsoft KB Archive/170642

From BetaArchive Wiki

FIX: Call to WSAIoctl with SIO_GET_INTERFACE_LIST Option Fails


The information in this article applies to:

  • Microsoft Win32 Application Programming Interface (API), included with:
    • Microsoft Windows NT Server version 4.0
    • Microsoft Windows NT Workstation version 4.0


When the SIO_GET_INTERFACE_LIST option is used in a call to WSAIoctl( ), the API returns WSAENOPROTOOPT or sometimes causes an access violation in wshtcpip.dll. As a result of this behavior, you cannot get a descriptive list of the network interfaces on your machine.


Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article.

This problem was corrected in Windows NT Service Pack 4.0.


Winsock2 has new functionality that enables you to obtain information about the network interfaces supported by your machine. Some of the information returned for each interface is:

IP address Subnet Mask Broadcast Address, etc.

You should have been able to get this information by making a call to the WSAIoctl( ) API with the SIO_GET_INTERFACE_LIST option. However, due to the bug mentioned above, the API fails with error WSAENOPROTOOPT or sometimes causes an access violation in wshtcpip.dll.


For additional information, please click the article number(s) below to view the article(s) in the Microsoft Knowledge Base:

Q181520 BUG: WSAIoctl SIO_GET_INTERFACE_LIST Option Problem

Q186312 SAMPLE: Intrfc.exe Programmatically Retrieves IP Interface Info

Additional query words:

Keywords : kbnetwork kbAPI kbOSWinNT400bug kbSDKPlatform kbWinsock kbOSWinNT400sp4fix kbGrpDSNet
Issue type : kbbug
Technology : kbAudDeveloper kbWin32sSearch kbWin32API

Last Reviewed: October 17, 1999
© 2001 Microsoft Corporation. All rights reserved. Terms of Use.