DOCUMENT:Q139731  08-AUG-2001  [winnt]
TITLE   :Network Errors Using 3COM 3C590 NIC In Windows NT
PRODUCT :Microsoft Windows NT
PROD/VER:WinNT:3.1,3.5,3.51
OPER/SYS:
KEYWORDS:kb3rdparty kbhw kbnetwork kbHardware

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The information in this article applies to:

 - Microsoft Windows NT Server version 3.1 
 - Microsoft Windows NT Workstation version 3.1 
 - Microsoft Windows NT Advanced Server, version 3.1 
 - Microsoft Windows NT Workstation versions 3.5, 3.51, 4.0 
 - Microsoft Windows NT Server versions 3.5, 3.51, 4.0 
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SYMPTOMS
========

When you use the 3Com 3C590 network interface card (NIC) with Windows NT,
network errors occur.

CAUSE
=====

This problem occurs in any network operating system. There is a problem with the
PCI busmastering on the 3Com 3C590 NIC.

RESOLUTION
==========

To correct this problem, disable the PCI busmastering of the NIC by modifying
the registry:

WARNING: Using Registry Editor incorrectly can cause serious, system-wide
problems that may require you to reinstall Windows NT to correct them. Microsoft
cannot guarantee that any problems resulting from the use of Registry Editor can
be solved. Use this tool at your own risk.

1. Run Registry Editor (REGEDT32.EXE).

2. From the HKEY_LOCAL_MACHINE subtree, go to the following key:

   \SYSTEM\CurrentControlSet\Services\EL59X1\Parameters

3. From the Edit menu, select Add Value.

4. Add the following:

   Value Name: Busmaster
   Data Type: REG_SZ
   Data: no

5. Choose OK and quit Registry Editor.

6. Shutdown and restart Windows NT.

MORE INFORMATION
================

This problem may be observed when a client computer is opening a Microsoft
Access database on a network share from a client computer.

NOTE: Other network access methods may not result in the symptoms for example,
file copy, opening Microsoft Word documents, and so on). Specifically, the
client may see one of the following messages from a client:

   disk or network error
   Fatal Exception Error
   General Protection Fault
   Dr Watson - access violation

Additional query words: prodnt bus master mastering

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Keywords          : kb3rdparty kbhw kbnetwork kbHardware 
Technology        : kbWinNTsearch kbWinNTWsearch kbWinNTW400 kbWinNTW400search kbWinNT351search kbWinNT350search kbWinNT400search kbWinNTW350 kbWinNTW350search kbWinNTW351search kbWinNTW351 kbWinNTW310 kbWinNTSsearch kbWinNTS400search kbWinNTS400 kbWinNTS351 kbWinNTS350 kbWinNTS310 kbWinNTAdvSerSearch kbWinNTAdvServ310 kbWinNTS351search kbWinNTS350search kbWinNTS310search kbWinNT310Search kbWinNTW310Search
Version           : WinNT:3.1,3.5,3.51

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