Hi, which NICs are you using? I had a system with an Intel 82573 NIC which would lock up under heavy load with UTM 9.3x. NIC errors would also appear in system.log (I'm not sure if XG has the same logs). Flood protection uses the Snort IPS, at least in UTM9; Snort tends to be very CPU-hungry and can be a bottleneck in many circumstances. Barry
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