Linux/Allow yajhfc to connect to hylafax port in passive mode - Centos - Iptables

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Open port 4559 tcp in firewall

Add following file /etc/modprobe.d/nf_conntrack_ftp.conf

options nf_conntrack_ftp ports=21,4559

Ensure that /etc/sysconfig/iptables-conf contains

IPTABLES_MODULES="nf_conntrack_ftp"