Minimize Number Of Repeated Entries In System Log By NetLogon

by [Published on 3 March 2011 / Last Updated on 10 Jan. 2010]

This article explains how you can use a registry hack to increase the interval for logging duplicate event entries in the System Event Log by the NetLogon service.

NetLogon service related event log entries are recorded in the System Event Log. There are few Event Log entries which are logged repeatedly by the NetLogon Service. The default behaviour of NetLogon service is to repeat the Event Log entry every 4 hours. This may cause serious performance issue on few servers where other Services are running and heavily loaded by the Network requests. You might need to increase the value as per your requirement. To increase the default 4 hours, change the following registry entry:

  • KEY Name: HKLM\System\CurrentControlSet\Services\NetLogon\Parameters
  • Entry Name: DuplicateEventLogTimeout
  • Type: REG_DWORD
  • Value: 0x3840 (4 hours)

0x3840 is the default value. This can be changed to as per your requirement. The maximum value is 0x418937 (47 days). The registry entry does not exist by default.



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The Author — Nirmal Sharma

Nirmal Sharma avatar

Nirmal Sharma is a MCSEx3, MCITP, and was awarded Microsoft MVP in Directory Services. In his spare time, he likes to help others and share some of his knowledge by writing tips and articles for various online communities. Nirmal can also be found contributing to PowerShell based Dynamic Packs for ADHealthProf.ITDynamicPacks.Net solutions.

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