I'm having an issue with the Sophos UTM, where I have a firewall rule that allows a client behind the firewall to connect to an OpenVPN server (I allow connections to UDP port 1194). Everything works great. However, when I enable UDP Flood Protection, the OpenVPN bandwidth drops by orders of magnitude (from over 100 Mbps to less than 3). I can see in the IPS logs that that the IPS flags a "UDP flood detected" to the IP and port of the OpenVPN server. I've added an exception to the IPS to ignore the OpenVPN service (port 1194), but it still flags it.
Am I missing something in the configuration?
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