Windows Sockets Programs Using WSIPX May Not Work

Windows Sockets programs that use the IPX protocol in Windows 95 may not work correctly. The program may indicate an "out of memory" error message.

One such program is Attachmate Extra Personal Client, which may not finish Setup successfully or generate error messages when it lists servers. After creating a socket, the program's Windows Sockets Bind() call fails with WSAENOBUFS(10055).

WSIPX calls IFSMGR to allocate memory from IFSMGR's heap. If IFSMGR is out of heap space and the allocation request is for less than one page (4 KB), IFSMGR does not grow the heap because it assumes this is an interrupt time allocation.

This issue is resolved by the following updated file for Windows 95, and later versions of this file:
A version of this file that also resolves this problem is included in the Windows Sockets 2.0 Update for Windows 95. For information about obtaining this update, see the following article in the Microsoft Knowledge Base:


The updated WSIPX resolves this problem by calling IFSMGR, when needed, to explicitly grow the heap.

Microsoft has confirmed that this is a problem in Microsoft Windows 95. 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.

For additional information about issues resolved by updates to this component, please see the following article in the Microsoft Knowledge Base: For additional information about Windows 95 updates, please see the following article in the Microsoft Knowledge Base: The third-party products that are discussed in this article are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products.