Microsoft KB Archive/155675

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IPX Headers Not Returned to WinSock Program

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Q155675

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The information in this article applies to:


 * Microsoft Windows 95

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SYMPTOMS
If the Windows Sockets setsockopt API is called with the IPX_RECVHDR option set, the call will return a status of "success," but IPX headers will not be received when the recv API is called.

CAUSE
There is a problem in the Windows Sockets support using the Microsoft IPX/SPX-compatible protocol, in that IPX headers are not returned with the WinSock data, even though it appears that the IPX_RECVHDR option is successfully set when calling setsockopt.

RESOLUTION
This issue is resolved by the following updated file for Windows 95 and OEM Service Release 2 (OSR2), and later versions of this file:

  WSIPX.VXD  version 4.00.952  dated 8/13/96  14,545 bytes

STATUS
Microsoft has confirmed this to be a problem in Microsoft Windows 95 and OEM Service Release 2 (OSR2). An update to address this problem is now available, but is not fully regression tested and should be applied only to computers experiencing this specific problem. Unless you are severely impacted by this specific problem, Microsoft does not recommend implementing this update at this time. Contact Microsoft Technical Support for additional information about the availability of this update.

This issue is resolved in Microsoft Windows 98.

MORE INFORMATION
The DS field in the IPX packet header is generally available to be used by IPX-aware programs, and can be accessed using the real-mode ECB (Event Control Block) API. The only supported method for accessing this information in the Win32 API set is by using the Windows Sockets APIs. With this update, Win32 programs running in Windows 95 can use the WinSock APIs to interact with NetWare Loadable Modules (NLMs) and legacy programs that make use of the DS field in the IPX header.

This functionality is available in the current version of Microsoft Windows NT.

For additional information about issues resolved by updates to this component, please see the following article in the Microsoft Knowledge Base:

Q171352 Large Data Transfer Using WinSock Over SPX May Not Work

Q163378 Microsoft Exchange Hangs Sending Message Using SPX

Q163329 Fatal Exception 0E in WSIPX Using Windows Sockets Program

Q161179 WinSock Zero-Length Packet Not Sent on Network

Q159254 Windows Sockets Applications Using WSIPX May Fail

For additional information about Windows 95 updates, please see the following article in the Microsoft Knowledge Base:

"Q161020 Implementing Windows 95 Updates" Keywords : kbnetwork kbpolicy win95 kbAPI kbSDKPlatform kbWinsock kbGrpDSNet

Issue type : kbprb

Technology : kbWin95search kbWin95