Microsoft KB Archive/139731

= Network Errors Using 3COM 3C590 NIC In Windows NT =

Article ID: 139731

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Advanced Server 3.1
 * Microsoft Windows NT Workstation 3.1
 * Microsoft Windows NT Advanced Server 3.1
 * Microsoft Windows NT Workstation 3.5
 * Microsoft Windows NT Workstation 3.51
 * Microsoft Windows NT Workstation 4.0 Developer Edition
 * Microsoft Windows NT Server 3.5
 * Microsoft Windows NT Server 3.51
 * Microsoft Windows NT Server 4.0 Standard Edition

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This article was previously published under Q139731



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
 * 1) From the Edit menu, select Add Value.
 * 2) Add the following:

Value Name: Busmaster

Data Type: REG_SZ

Data: no
 * 1) Choose OK and quit Registry Editor.
 * 2) 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

Keywords: kbhardware kbnetwork kb3rdparty KB139731

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