Internet Information Services (IIS)
To be able to process Internet Information Services (IIS) events, you must enable the Remote Registry service on the target computers. Windows Server
To configure the Operational log size and retention method
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On the computer where IIS is installed, navigate to Start > Windows Administrative Tools → Event Viewer.
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Navigate to Event Viewer tree → Applications and Services Logs → Microsoft → Windows and expand the IIS-Configuration node.
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Right-click the Operational log and select Properties.
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Make sure Enable logging is enabled.
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Set Maximum log size to 4 GB.
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Make sure Do not overwrite events (Clear logs manually) is cleared. If selected, change the retention method to Overwrite events as needed (oldest events first).