GetHostByName API Returns Unbindable Addresses

ID: Q217001

The information in this article applies to:

Microsoft Windows NT Server version 4.0 SP4
Microsoft Windows NT Server, Enterprise Edition version 4.0 SP4
Microsoft Windows NT Workstation version 4.0 SP4

SYMPTOMS

After you apply Windows NT 4.0 Service Pack 4, Windows Sockets applications using the "bind()" function with IP address information retrieved using "GetHostByName()" to return localhost IP addresses may fail and return the following error message:

10049 (WSAEADDRNOTAVAIL)

CAUSE

A change was introduced in Service Pack 4 that causes NDISWAN Services to return IP addresses in the order in which they are bound. This change resulted in IP addresses not currently bound to the TCP/IP stack to be returned when making a call to the Winsock API function GetHostbyName(). Sockets applications using the "bind()" function for individual addresses returned from "GetHostByName()" on systems running the RAS (Remote Access Server) Service may experience this problem.

RESOLUTION

To resolve this problem, obtain the latest service pack for Windows NT 4.0 or the individual software update. For information on obtaining the latest service pack, please go to:

http://www.microsoft.com/Windows/ServicePacks/

Q152734 How to Obtain the Latest Windows NT 4.0 Service Pack

For information on obtaining the individual software update, contact Microsoft Product Support Services. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:

http://www.microsoft.com/support/supportnet/overview/overview.asp

This hotfix has been posted to the following Internet location as Rnr-fixi.exe (x86) and Rnr-fixa.exe (Alpha):

ftp://ftp.microsoft.com/bussys/winnt/winnt-public/fixes/usa/NT40/hotfixes-postSP4/Rnr-fix/

STATUS

Microsoft has confirmed this to be a problem in Windows NT 4.0 Service Pack 4. This problem was first corrected in Windows NT version 4.0 Service Pack 5.

Additional query words: 4.00 sp4

Keywords : kbbug4.00 kbfix4.00 nt4sp5fix
Version : winnt:4.0 SP4
Platform : winnt
Issue type : kbbug