Windows XP SP3 fully Updated ESET Smart Security Version 184.108.40.206 Belkin Wireless Router Model SURF N300 I happened to visualy notice the arrival of ESET Module Updates on 6 September 2011 and immediately after that the Belkin Icon on the taskbar began to dim indicating a problem with the Router. Hovering over the icon gave the message "Not connected". The connection was between my desktop and the router directly by LAN (wireless actually off as not needed at that time). I tried everything with the router - update software (not needed) complete re-install (no difference). After some time of persuing possible outcomes I concentrated on ESET thinking that it must have NOT been a co-incidence that the problem seemed to be related to the Module Update. Long story - shortened - I discovered that in the IDS Firewall settings that unticking "covert data in ICMP protocol detection" fixed the problem i.e. the Router stabilised and began to glow green and work again. The Firewall logs showed the following messages continuously (reprinting every second) :- 6/09/2011 6:35:48 PM Detected covert channel exploit in ICMP packet 192.168.2.2 192.168.2.1 ICMP 6/09/2011 6:35:47 PM Detected covert channel exploit in ICMP packet 192.168.2.2 192.168.2.1 ICMP I suspect the update module causing the issue was the Personal firewall module: 1068 (20110727) My worry is that I have unticked what was a default setting in the firewall and am now at increased risk. Will there be a fix from ESET so I can once again re-tick that setting? Thanks for your help.