On CentOS 6.6-At first, iptables was blocking access to my FTP server at all while it was on. After some research I added the lines to /etc/sysconfig/iptablesthat are suggested in the question Iptables to allow incoming FTP and it works... for about 2 minutes, then I can no longer connect to my server. If I then /sbin/service iptables stop/sbin/service iptables startIt will work again... for a few minutes. This is infuriating.Any help is appreciated thank you.
iptables blocking incoming FTP traffic 2/3 minutes after being reset
centos;iptables;ftp