I took absolutley ages to work this out. Basically ICS, sets up its own mini dhcp and dns server, these will be conflicting with your 2003 server. There are two options (unless I am totally wrong cuz 2003 may be ok with this, anyone feel free to correct me) 1. Use a third party product to do your connection sharing 2. Set up 2003 dns and dhcp to correctly route your traffic 3. Do like i did and shell out on a broadband/adsl router, origo do one via ebuyer for about £30 good luck