DOCUMENT:Q131073  08-AUG-2001  [winnt]
TITLE   :Datagram Sends Fail if Route is Not in IPX Cache
PRODUCT :Microsoft Windows NT
PROD/VER:3.51
OPER/SYS:
KEYWORDS:kbnetwork

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The information in this article applies to:

 - Microsoft Windows NT Workstation version 3.51 
 - Microsoft Windows NT Server version 3.51 
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SYMPTOMS
========

If your transport driver interface (TDI) program is a client of the IPX protocol
and uses datagram-sends for connectionless sends at an interval that is greater
than 15 minutes, it fails. If the interval is shorter than 15 minutes, your TDI
client performance is slowed down.

This symptom occurs if your TDI client program is a socket program using
datagram-sends, the NetWare redirector, or the Server Message Block (SMB)
redirector or server.

The problem does not occur with the SPX or NetBEUI protocol, or their TDI
clients. The RIP protocol is also not affected by this problem.

CAUSE
=====

When your transport driver interface (TDI) client does a send to a destination
whose route is not in the IPX cache, IPX sends a corrupted packet in form of
some superfluous bytes appended to the IPX header. The next time the client
sends the datagram, assuming it is within 15 minutes which is the default
routing information protocol (RIP) time-out, it succeeds. If a send happens
after 15 minutes, then assuming that the route did not get cached again, the
send fails. A subsequent send succeeds. This pattern repeats itself with each
datagram send in these intervals.

RESOLUTION
==========

To correct this problem, install the latest U.S. Service Pack for Windows NT
version 3.51.

STATUS
======

Microsoft has confirmed this to be a problem in Windows NT version 3.51. This
problem has been corrected in the latest U.S. Service Pack for Windows NT
version 3.51. For information on obtaining the Service Pack, query on the
following word in the Microsoft Knowledge Base (without the spaces):

   S E R V P A C K

Additional query words: prodnt

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Keywords          : kbnetwork 
Technology        : kbWinNTsearch kbWinNTWsearch kbWinNT351search kbWinNTW351search kbWinNTW351 kbWinNTSsearch kbWinNTS351 kbWinNTS351search
Version           : 3.51

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