Network Errors Using 3COM 3C590 NIC In Windows NT

• Microsoft Windows NT operating system version 3.1
• Microsoft Windows NT Advanced Server version 3.1
• Microsoft Windows NT Workstation versions 3.5, 3.51 and 4.0
• Microsoft Windows NT Server versions 3.5, 3.51 and 4.0 -------------------------------------------------------------------------

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.