Hi Pulukas, thanks for taking a look. Unfortunately, this is the guide I used and linked in my original post. I have everything setup as per the article but we have been having a number of files getting through. I have since raised a ticket with Palo regarding this and the engineer I was talking to confirmed the settings were correct and couldn't see why the files were getting through 3 days after the hash had been identified. It has therefore been escalated and I am now in the process of providing the various logs required for investigation. I suspect that this issue is down to human error and there is some setting/policy somewhere which is causing this headache, I just hope it is sorted soon :). I will let you know if I get a solution, as I noticed in the article you linked, other people were having similar issues.
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