WLBS May Discard Some TCP/UDP Fragments

ID: Q247819

The information in this article applies to:

Microsoft Windows NT Server, Enterprise Edition version 4.0
Microsoft Windows NT Server version 4.0

SYMPTOMS

When your Windows NT 4.0-based computer is using Transmission Control Protocol (TCP) or User Datagram Protocol (UDP) packets, you may experience unpredictable network connectivity problems. Intermittent and undetectable loss of traffic may occur when the datagram size exceeds a network's Maximum Transmission Unit (MTU) size.

RESOLUTION

A supported fix that corrects this problem is now available from Microsoft, but it has not been fully regression tested and should be applied only to systems experiencing this specific problem. If you are not severely affected by this specific problem, Microsoft recommends that you wait for the next Windows NT 4.0 service pack that contains this fix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. 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:

http://www.microsoft.com/support/supportnet/overview/overview.asp

The English version of this fix should have the following file attributes or later:


   Date         Time     Size      File name   Platform
   -------------------------------------------------------------
   10/12/1999   08:44p    36,112   Wlbs.exe    x86    
   10/29/1999   02:06p    60,208   Wlbs.sys    x86
   10/12/1999   08:43p    51,472   Wlbs.exe    Alpha
   10/29/1999   02:05p   101,104   Wlbs.sys    Alpha

STATUS

Microsoft has confirmed this to be a problem in Windows NT 4.0.

Additional query words:

Keywords : kbnetwork ntsp kbbug4.00 kbfix4.00
Version : winnt:4.0
Platform : winnt
Issue type : kbprb