Dropped connections with ESS 4.0 beta

I am trialling ESS 4.0.68.0 beta but I am experiencing dropped connections every 5 minutes or so. I am using Firefox and Open DNS. This is a copy of my log:

07/12/2008 14:24:41 Packet blocked by active defense (IDS) 208.69.34.230:80 192.168.1.2:2300 TCP
07/12/2008 14:23:42 Packet blocked by active defense (IDS) 66.135.57.83:80 192.168.1.2:2474 TCP
07/12/2008 14:23:37 Packet blocked by active defense (IDS) 208.69.34.230:80 192.168.1.2:2300 TCP
07/12/2008 14:22:33 Packet blocked by active defense (IDS) 208.69.34.230:80 192.168.1.2:2300 TCP
07/12/2008 14:21:29 Packet blocked by active defense (IDS) 208.69.34.230:80 192.168.1.2:2300 TCP
07/12/2008 14:20:25 Packet blocked by active defense (IDS) 208.69.34.230:80 192.168.1.2:2300 TCP
07/12/2008 14:19:21 Packet blocked by active defense (IDS) 208.69.34.230:80 192.168.1.2:2300 TCP
07/12/2008 14:18:32 Packet blocked by active defense (IDS) 208.69.34.230:80 192.168.1.2:2300 TCP
07/12/2008 14:18:07 Packet blocked by active defense (IDS) 208.69.34.230:80 192.168.1.2:2300 TCP
07/12/2008 14:17:48 Packet blocked by active defense (IDS) 192.168.1.2:2300 208.69.34.230:80 TCP
07/12/2008 14:17:42 Packet blocked by active defense (IDS) 208.69.34.230:80 192.168.1.2:2300 TCP
18/11/2008 19:52:39 Detected DNS cache poisoning attack 192.168.1.1:53 192.168.1.2:61017 UDP

208.69.34.230:80 appears to be the IP address of Open DNS.
I am not a firewall techie, so could someone tell me what is happening and how to prevent this.
Many Thanks

 

Wrong Forum

 

What mode is the firewall running?

 

I have run the firewall in interactive and automatic modes with the same result.