Large Data Transfer Using WinSock Over SPX May Not Work

 Last reviewed: July 14, 1997
Article ID: Q171352
The information in this article applies to:
  • Microsoft Windows 95

SYMPTOMS

When you are attempting to use the Windows Sockets (WinSock) interface to transfer large blocks of data using the SPX protocol, the transfer may not work. When this problem occurs, the program being used to transfer the data may appear to have stopped responding (hung). Depending on the configuration, this problem may occur when the size of the data block exceeds 15-40K.

CAUSE

The Windows Sockets IPX/SPX Protocol Driver (WSIPX) may not allocate enough internal resources to allow large blocks of data to be received successfully.

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.

RESOLUTION

It is possible to work around this problem by rewriting the program that uses WinSock to transfer the data so that the program transfers a smaller block of data at a time.

MORE INFORMATION

The updated component allows up to 64K of data to be successfully sent and received in a single block.

Additional query words: hang hangs
Keywords : kbnetwork win95
Version : WINDOWS:95
Platform : WINDOWS

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Last reviewed: July 14, 1997
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