Ok, I've been wanting to use ICS for a while now, and finally got it to work (I'm a bit of a networking newb). However, it won't work if I have ZoneAlarm on stealth mode (I'm using Zonealarm 4.5). I did a bit of googling and this seems to be a known issue, but I could not find any solutions asides from upgrading to ZoneAlarm Pro.
I'm hoping someone knows how to get ICS to work with Zonealarm, or at least can recommend a different (free) firewall to me. I'd like to stick with Zonealarm though because it is so simple to use and configure.