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TCP port 21

Question: I've vsftpd ftp server configured under FreeBSD 7.x and PF firewall. Both PF and FTP server running on a dedicated FreeBSD web server. How do I configure PASSIVE FTP PF firewall configuration so that my vsftpd work? How do I configure PF firewall to protect an FTP server and open port 21?
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Iptables Open FTP Port 21 and 20

How do I open port 21 using Linux iptables firewall?
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