Advisory: Sophos Endpoint "Your connection isn't private" after reboot. Policy settings can be returned to normal. See: KB-000045954 for the latest updates.

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Sophos Firewall - extremely poor bandwidth when DoS enabled


I just set up a new Sophos Firewall on my Dell XPS tower (testing). It was all working nice, I was getting about 230 Mbps bandwidth from Then I enabled DoS from Intrusion Prevention --> DoS & spoof protection [tab] --> DoS settings. I clicked the checkbox for SYN flood, UDP flood, TCP flood, and ICMP/ICMPv6 flood. Then my bandwidth went to crap. The max download speeds I get are ~9 Mbps. Ammm.... I missing something? I even tried setting my WAN port to 1000 Mbps - Full Duplex. Advanced Threat Protection is also disabled.

I'm using firmware SFOS 18.5.1 MR-1-Build326 (updated from the initial build I downloaded (SFOS 18.0.5 MR-5-Build586).

I found this page but it's a little outdated so the instructions aren't the same as my GUI, plus the discussion has been locked:

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