Fedora Core 8 doesn't exist; Fedora 7 will be released in May of this year, and current is Fedora Core 6. You can check your release from a terminal with:
cat /etc/fedora-release
Ports are opened when a service is running. If you want to allow access to those ports through the firewall, via a command-line interface, then run:
system-config-securitylevel-tui
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