Policy

Specify maximum log file size

Windows 11 25H2

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Policy overview

Key metadata and intent for this policy.

ClassComputer
CategorySystem > Net Logon
Supported onAt least Windows Server 2003

Supported OS tags: Windows10, Windows10RT, Windows11, Windows7, Windows8, Windows81, WindowsRT, WindowsRT81, WindowsServer2003, WindowsServer2008, WindowsServer2012, WindowsServer2012R2, WindowsServer2016, WindowsVista

This policy setting specifies the maximum size in bytes of the log file netlogon.log in the directory %windir%\debug when logging is enabled. By default, the maximum size of the log file is 20MB. If you enable this policy setting, the maximum size of the log file is set to the specified size. Once this size is reached the log file is saved to netlogon.bak and netlogon.log is truncated. A reasonable value based on available storage should be specified. If you disable or do not configure this policy setting, the default behavior occurs as indicated above.

Internal name
Netlogon_MaximumLogFileSize
Policy ID
c21d977bd4e6
Elements
1

Registry values

How enabled and disabled states update the registry.

No explicit registry values are set for enabled or disabled states.

Policy elements

Inputs and configuration options exposed by this policy.

ElementTypeRegistry mappingConstraints & behavior
Bytes:
ID Netlogon_MaximumLogFileSizeLabel
decimal
HKLM\Software\Policies\Microsoft\Netlogon\Parameters\MaximumLogFileSize
Type REG_DWORD
Range: ? to 4294967295

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