From what I understand, they are 3rd party because they aren't on the list of 'accepted sites' in the Zone Alarm settings (though that may not be the exact technical explanation in the new versions of Zone Alarm, its the general idea). From what I've read, ZoneAlarm reads 3rd party cookies from sites not on the acceptable site list as being ads and blocks them. I wasn't able to confirm this on the ZoneAlarm site as their support area requires that you have downloaded or purchased the product.
We have a FAQ on how to tweak the firewall that comes with XP and Zone Alarm here that your users may find useful:
http://infopopfaq.infopop.net/0/Ope...009141&f=6240938335&m=6980943942 Kristi Horn
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