There are instances wherein traffic is dropped due to firewall rule 0. Rule 0 is the implicit default drop rule on the XG Firewall. This traffic either did not match any existing configured firewall rules and was dropped. It could also be invalid as the firewall was not expecting this traffic such as duplicate ACKs, it does not meet the requested or expected TCP states or RFC specifications, a case of an asymmetric routing, etc.
Applies to the following Sophos products and versions Sophos Firewall
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