After one stop & start the iptables, I managed to lose all the connections to the FTP:
root@server [~]# service iptables stop
Flushing firewall rules: [ OK ]
Setting chains to policy ACCEPT: mangle filter [ OK ]
Unloading iptables modules: [ OK ]
root@server [~]# service iptables start
Flushing firewall rules: [ OK ]
Setting chains to policy ACCEPT: filter [ OK ]
Unloading iptables modules: [ OK ]
Applying iptables firewall rules: [ OK ]
Loading additional iptables modules: ip_conntrack_netbios_n[ OK ]Consequence: [R] Data Socket Error: Connection failed [FTP] incoming / outgoing, although in the server it appears that I was logged in, I had nothing to do.
SOLVING:
root@server [~]# iptables -A INPUT -p tcp --dport 21 -j ACCEPT
root@server [~]# modprobe ip_conntrack_ftp“/” is your current location ;-)
