6144: Security policy in the group policy objects has been applied successfully
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This is a useful event. This event does not just get logged each time Group Policy refreshes. It only gets logged (based on testing Win2012R2) when something in Security Settings the RSOP has changed (i.e. someone edited a Security Setting in one of the GPOs applicable to this computer, or Local Security Policy)thus necessitating Windows to adjust local configuration to meet Group Policy. So basically this event tells you a security configuration change has occurred due to Group Policy (including Local Security Settings). It doesn't tell you which policy(ies) but at least you know something has changed.
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