WinXP SP2,
ZoneAlarm Free version:8.0.298.000
TrueVector version:8.0.298.000
Driver version:8.0.298.000

Contrary to Help, there is no "custom" button in Firewall configuration. There is no way to make ZAF open non-standard ports. Worse, the ports apparently remain closed even when ZAF is turned "off".