Protected Mode NetBEUI Causes TCP/IP Failure (111979)


The information in this article applies to:

  • Microsoft LAN Manager 2.2
This article was previously published under Q111979

SYMPTOMS

Using an ICL EtherTeam 16i adapter and the protected mode redirector on Windows for Workgroups 3.11 can cause the LAN Manager 2.2b TCP/IP (TCP 1.0a) to fail under certain circumstances.

After starting Windows for Workgroups, you should be able to ping in a command window. If you are using protected mode NetBEUI, however, and start a large software package (such as Excel) over the net, an attempt to ping in a window fails with a DGN0209 error. NetBEUI works, but TCP/IP fails.

CAUSE

If the MAC driver for the ICL card fails to copy the frame on TransferData (more likely while loading Excel from the server over NetBEUI), the TCP/IP driver fails to release the buffer, resulting in a memory leak that eventually makes the TCP/IP stack non-functional.

RESOLUTION

Contact Microsoft Product Support Services for the fix for LAN Manager MS-DOS TCPTSR.EXE in CSD00.083. It is not included in LAN Manager 2.2b Service Pack.
Modification Type:MajorLast Reviewed:9/30/2003
Keywords:KB111979
©2003 Microsoft Corporation. All rights reserved.