WSAEMSGSIZE - Error 10040 in Winsock 2.0


The Microsoft Winsock 2.0 WSARecvFrom() function does not function and may display the following error message when used in a User Datagram Protocol (UDP) socket program:

WSAEMSGSIZE - Error 10040
The WSARecvFrom function does not function when a buffer counter greater than one is specified and the receiving datagram size exceeds 1,470 bytes.

The WSAEMSGSIZE error message may appear when the buffer size is not large enough to accomodate the receiving datagram.


If the datagram is fragmented, then the TCP driver does not fill the second Memory Descriptor List (MDL) in the I/O Request packet chain.


Windows NT Server or Workstation 4.0

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:
  • 152734 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:

Windows NT Server 4.0, Terminal Server Edition

To resolve this problem, obtain the latest service pack for Windows NT Server 4.0, Terminal Server Edition. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
152734 How to Obtain the Latest Windows NT 4.0 Service Pack


Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Windows NT Server version 4.0, Terminal Server Edition Service Pack 6.

ID articolo: 225004 - Ultima revisione: 11 giu 2012 - Revisione: 1