Microsoft KB Archive/253445

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System Process Hangs Windows NT with Novell Client 4.6

Article ID: 253445

Article Last Modified on 11/1/2006


  • Microsoft Windows NT Workstation 4.0 Developer Edition
  • Microsoft Windows NT Server 4.0 Standard Edition

This article was previously published under Q253445


A Windows NT 4.0-based server may experience a sudden and steady rise in CPU usage that continues to increase until the server stops responding (hangs). In Task Manager, the System process appears to be responsible for this behavior.


The Performance Monitor log indicates that immediately before this behavior occurs, there is a dramatic increase in the "Packets received/sec" counter on the server.

The Network Monitor log indicates that a Novell server sent a packet to the Windows NT-based server. This packet lets the Windows NT-based server know that the NetWare server has a message for it. The Windows NT-based server responds by requesting the message from the NetWare server. The NetWare server responds with an "Unknown Object" response, but still has a bit set in the response that causes the Windows NT-based server to query again for the message. This creates a continuous loop of requests for the message from Windows NT and denials by NetWare.

This locked loop causes the network packet traffic between the servers to run out of control, increasing the CPU usage until the Windows NT-based server hangs.


There is a patch from Novell for the NetWare client to install on the Windows NT-based server. This patch is for the NetWare Client version 4.6 software.

For additional information about this patch, see the following Novell article on the Novell Web site:

Document Title: Broadcast message causes high workstation utilization.
Document ID: 10019679
Solution ID: 1.0.34940405.2363567
Creation Date: 14OCT1999
Modified Date: 15DEC1999
Novell Product Class: NetWare

Keywords: kb3rdpartynetclient kbenv kbnetwork kbprb KB253445