To get squeezeboxserver working on Fedora, add the following to /etc/sysconfig/iptables:
# squeezebox
-A INPUT -m state --state NEW -m tcp -p tcp --dport 9000 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 3483 -j ACCEPT
-A INPUT -m state --state NEW -m udp -p udp --dport 3483 -j ACCEPT