So there was an interesting case which floated my way the other day.
The Audit policies in the domain controllers policy was set to the following, and there were no other policies blocking or changing these.
After a policy update the following events were logged:
In addition, auditpol /get /category:* simply would show no auditing after policy update:
So, where was this crazy thing being overwritten? It wasn’t in the policies, since we checked all of them carefully for inheritance etc..
Looking at where a client actually stores audit policy may give us a clue (C:\Windows\system32\grouppolicy\machine\microsoft\windows nt\audit\audit.csv and C:\Windows\security)
But there was nothing there of interest. So, the last place to look was the sysvol data:
Aha! Under here was the .CSV file with the headings - but no configuration data in it!
We removed this file and now audit policies flowed properly to the DCs and audit event were generated.
Odd. It turns out that they had applied the policies via a GPOBackup and perhaps something had occurred prior to the backup.
Anyway – hope it helps someone someday