Comodo and Home network Problem

I did a search but didn’t find anything that pertained to my problem so here goes…

I have Comodo installed on all my computers and it works great, however, I have just built a small computer that I have put between my router and hi-speed hub, which I want to act as the protecting computer for my others (thereby not needing protection on the networked computers)

However I seem to have run into a little problem… Once I installed Comodo on my new computer, although it found my home network and internet conneciton just fine I found that it just lets everything on the home network go in and out without doing a thing about it…
EG: Home comp 1 can send receive from the Internet without Comodo on the new computer blinking an eye, so can Home comp 2 and home comp 3…

My computers setup is as follows.

Router - New computer (with Comodo) - Hi-speed hub - computers 1,2,3

Don’t know if it is important or not, but ICS is turned on on the new computer.

Could anyone give me any tips on what I might be doing wrong please?