Microsoft KB Archive/163378

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Microsoft Exchange Hangs Sending Message Using SPX

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Q163378

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The information in this article applies to:


 * Microsoft Windows 95

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SYMPTOMS
Microsoft Exchange or Windows Messaging may stop responding (hang) when you try to transmit a message using SPX over a dial-up connection.

This problem occurs only if the installed version of NWLINK is dated before 6/27/96 and the Wsipx.vxd file is dated before 3/5/97.

CAUSE
This problem occurs only when Microsoft Exchange or Windows Messaging is started offline and you use the Deliver Now command to deliver messages over a dial-up connection.

The problem occurs because WSIPX submits a larger frame than is supported. SPX checks the NDIS packet frame size against the connection's maximum frame size and hangs or returns a "The message cannot be delivered" error message. The NDIS packet frame size is 1497 bytes and the maximum frame size is 1160 bytes.

RESOLUTION
This issue is resolved by the following updated file for Windows 95 and OSR2, and later versions of this file:

  WSIPX.VXD  version 4.00.955  dated 2/18/97  14,545 bytes 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:

"Q182108 Availability of Windows Sockets 2.0 for Windows 95"

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
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

Q163329 Fatal Exception 0E in WSIPX Using Windows Sockets Program

Q161179 WinSock Zero-Length Packet Not Sent on Network

Q155675 IPX Headers Not Returned to WinSock Program "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 : kberrmsg kbnetwork win95

Issue type : kbprb

Technology : kbWin95search kbWin95