Microsoft KB Archive/178381

= SNMP Leaks Memory If the OID Cannot Be Decoded =

Article ID: 178381

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Server 4.0, Terminal Server Edition
 * Microsoft Windows NT Workstation 4.0 Developer Edition
 * Microsoft Windows NT Server 4.0 Standard Edition

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This article was previously published under Q178381



SYMPTOMS
Over time, the Windows NT system responsiveness appears sluggish, and Clients may report a gradual decrease in system performance.

By tracking the amount of Private Bytes for Snmp.exe, it can be observed that, over time, it increases without decreasing. This is viewable using Windows NT Performance Monitor by selecting the following counter to monitor:

Object: Process

Instance: SNMP

Counter: Private Bytes



CAUSE
If SNMP cannot decode an OID from a network packet, SNMP does not free up the memory, resulting in a memory leak in the Snmp.exe processes. The impact of this leak will be more evident on a system running on a network segment that receive lots of SNMP broadcast traffic.



RESOLUTION
To resolve this problem, obtain the latest service pack for Windows NT 4.0 or Windows NT Server 4.0, Terminal Server Edition. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

152734 How to Obtain the Latest Windows NT 4.0 Service Pack



STATUS
Microsoft has confirmed that this is a problem in Windows NT 4.0 and Windows NT Server 4.0, Terminal Server Edition. This problem was first corrected in Windows NT 4.0 Service Pack 4.0 and Windows NT Server 4.0, Terminal Server Edition Service Pack 4.

Additional query words: SNMP debug

Keywords: kbhotfixserver kbqfe kbapi kbbug kbfix kbnetwork kbqfe kbsnmp KB178381

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