Microsoft KB Archive/174231

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DHCP Uses 100% CPU If First Network Card Is Disabled

Article ID: 174231

Article Last Modified on 10/31/2006


  • Microsoft Windows NT Server 4.0 Standard Edition

This article was previously published under Q174231


On a multihomed computer, you disable the loading of the network card driver (in Control Panel, double-click Devices) or the driver fails to load because of a problem. Following a restart, you observe excessive CPU usage by the Tcpsvcs.exe process.


When DHCP initializes, it attempts to open a socket on each TCP/IP interface. Because the network card driver was disabled, this results in an error. The DHCP service does not correctly handle this case.


To work around this problem, perform the following steps:

  1. Go to Control Panel and double-click Network.
  2. Click the Bindings tab.
  3. Select the network adapter that has the disabled driver.
  4. Click Disable, and then click OK.


Microsoft has confirmed this to be a problem in Windows NT version 4.0. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

Additional query words: DHCP binding prodnt

Keywords: kbbug kbnetwork KB174231