Microsoft KB Archive/152990

= 100-Megabit Ethernet May Hang or Exhibit Poor Performance =

Article ID: 152990

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Workstation 3.5
 * Microsoft Windows NT Workstation 3.51
 * Microsoft Windows NT Server 3.5
 * Microsoft Windows NT Server 3.51

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This article was previously published under Q152990



SYMPTOMS
The client system may stop responding when transferring files between two Microsoft Windows NT version 3.51 computers using 100-megabit Ethernet cards over a 100-megabit segment. The receiving system or client stops responding and the CPU usage stays at 100 percent until the file transfer is completed. You may also see lower than expected transfer rates.



WORKAROUND
To work around this problem, change the Server Optimization to Balance on both the Windows NT Server and Windows NT Workstation. To change the Server Optimization for a Windows NT Server, configure the Server service using the Control Panel Network tool, and set Server Optimization to Balance. To change the Server Optimization for a Windows NT Workstation you need to modify the Registry.

WARNING: Using Registry Editor incorrectly can cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk.


 * 1) Start Registry Editor (Regedt32.exe) select the following subkey:

HKEY_LOCAL_MACHINE\System\CurrentControlSet \Services\LanmanServer\Parameters
 * 1) Add or change the following value:

Size REG_DWORD: 0 x 2

The value 0 x 2 sets the Server Optimization option to Balance.



STATUS
Microsoft has confirmed this to be a problem in Microsoft Windows NT versions 3.50 and 3.51. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

Additional query words: prodnt

Keywords: kbusage KB152990

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