How do I get Internet Connection Sharing (ICS) to work with free ZoneAlarm?
The free version of ZoneAlarm does not support ICS. Your options are to set Internet Zone to Medium setting (on the ICS gateway machine only), or you can upgrade to the paid versions of ZoneAlarm, which fully support ICS, allowing you to keep Internet Zone set to high. Also see here: http://zonealarm.donhoover.net/icssettings.
