Microsoft KB Archive/197491

= XADM: Downloading an NNTP Message with a Large Header May Cause the Information Store to Consume 100% of CPU Time =

Article ID: 197491

Article Last Modified on 10/28/2006

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APPLIES TO


 * Microsoft Exchange Server 5.5 Standard Edition

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This article was previously published under Q197491





SYMPTOMS
The Microsoft Exchange information store process (Store.exe) may consume 100 percent of the server's processor time. This is viewed by using the Windows NT Performance Monitor utility, clicking the Object:Process and the Counter:% CPU Utilization. Also, viewing the "% CPU Utilization" of all of the threads being used by the store process (in Performance Monitor, click Object:Thread and Instance:STORE; add all of the instance STORE to the chart) one thread will appear to be consuming 100 percent of the CPU time.



CAUSE
An NNTP client was downloading a NNTP message from a folder in the Public Store, this message had a subject line greater than 20 KB. The buffer being used to hold the subject line was hardcoded at 20 KB. Therefore the code was continually looping trying to read in the contents of the subject line that were past this 20 KB limit. This process resulted in high CPU usage by the information store process.



RESOLUTION
To resolve this problem, obtain the latest service pack for Exchange Server version 5.5. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

191014 XGEN: How to Obtain the Latest Exchange Server 5.5 Service Pack

The English version of this fix should have the following file attributes or later: Component: Information Store

File Name   Version -  Gapi32.dll   5.5.2502 Mdbmsg.dll  5.5.2502 Store.exe   5.5.2502



STATUS
Microsoft has confirmed this to be a problem in Microsoft Exchange Server version 5.5. This problem was first corrected in Exchange Server 5.5 Service Pack 3.

Additional query words: crash hang

Keywords: kbhotfixserver kbqfe kbbug kbfix kbqfe KB197491

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