What does "Unknown" in the Firewall Events Rule ID Column Mean?

Security
#1

I see a lot of IP addresses in my Firewall Events page that are tagged as Unknown in the Rule ID column. These are all blocked but not sure what that tag means. The Details window doesn’t give any information like it does for other events (e.g., False IE6 detection [Type C]).

Any idea what “Unknown” means and what can trigger it?

#2

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