Microsoft KB Archive/254644

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SMS: Network Monitor Experts Increase CPU Utilization and Finish Slowly

Article ID: 254644

Article Last Modified on 10/27/2006


  • Microsoft Systems Management Server 2.0 Service Pack 1

This article was previously published under Q254644


When you use the TCP Retransmit expert or the Server Response Time expert in Microsoft Network Monitor version 5.00.943 on a large (greater than 2 megabytes) network capture, it may need 30 or more minutes to complete, and Network Monitor may increase central processing unit (CPU) utilization to 100 percent on the computer during this time. Note that Network Monitor version 5.00.943 is included in Systems Management Server (SMS) version 2.0, Service Pack 1 (SP1).


This problem can occur because the MSRPC parser in this version of Network Monitor continually looks back (recursively) in its recognize function. Because of this, every time the parser engine moves on to the next frame, it goes back and looks at all previous frames again, causing it to be extremely slow.


To work around this problem, you can disable the MSRPC parser:

  1. Quit Network Monitor if it is running, and then open the NETMON\i386\Parsers folder.
  2. Rename the Msrpc.dll and Msrpc.ini files in this folder to Msrpc.olddll and Msrpc.oldini.
  3. Restart Network Monitor, and then test filtering and the use of experts.


Microsoft has confirmed this to be a problem in Systems Management Server version 2.0.

Additional query words: prodsms bloodhound netmon expert netmon.exe

Keywords: kbbug KB254644