Vsftpd not working with my IPTABLE rules

Question

When I flush my IPTABLE rules (iptables --flush) vsftpd work is fine.
But not work with my IPTABLE rules/

Ubumtu 16.10.1 x64
All IPTABLE Rules
xxx.xxx.xxx.xxx - its my IP adress
enp2s0 - my Ethernet card

*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:lim1 - [0:0]
-A INPUT -p tcp -m tcp --dport 47050 --tcp-flags FIN,SYN,RST,ACK SYN -m connlimit --connlimit-above 20 --connlimit-mask 32 --connlimit-saddr -j DROP
-A INPUT -p tcp -m tcp --dport 48050 --tcp-flags FIN,SYN,RST,ACK SYN -m connlimit --connlimit-above 20 --connlimit-mask 32 --connlimit-saddr -j DROP
-A INPUT -s ххх.хxx.ххх.ххх/32 -j ACCEPT
-A INPUT -i enp2s0 -p tcp -m tcp --dport 47050 -j ACCEPT
-A INPUT -i enp2s0 -p tcp -m tcp --dport 48050 -j ACCEPT
-A INPUT -i enp2s0 -p tcp -m tcp --dport 22 -j ACCEPT
-A INPUT -i enp2s0 -p tcp -m tcp --dport 80 -j ACCEPT
-A INPUT -d 127.0.0.1/32 -p tcp -m tcp --dport 3306 -j ACCEPT
-A INPUT -s 127.0.0.1/32 -p tcp -m tcp --dport 3306 -j ACCEPT
-A INPUT -d 127.0.0.1/32 -p tcp -m tcp --dport 47050 -j ACCEPT
-A INPUT -s 127.0.0.1/32 -p tcp -m tcp --dport 47050 -j ACCEPT
-A INPUT -d 127.0.0.1/32 -p tcp -m tcp --dport 48050 -j ACCEPT
-A INPUT -s 127.0.0.1/32 -p tcp -m tcp --dport 48050 -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 47050 -m recent --update --seconds 2 --name DEFAULT --mask 255.255.255.255 --rsource -j DROP
-A INPUT -p tcp -m state --state NEW -m tcp --dport 47050 -m recent --set --name DEFAULT --mask 255.255.255.255 --rsource -j ACCEPT
-A INPUT -p tcp -m state --state NEW -m tcp --dport 48050 -m recent --update --seconds 2 --name DEFAULT --mask 255.255.255.255 --rsource -j DROP
-A INPUT -p tcp -m state --state NEW -m tcp --dport 48050 -m recent --set --name DEFAULT --mask 255.255.255.255 --rsource -j ACCEPT
-A INPUT -i enp2s0 -p icmp -m icmp --icmp-type 0 -j ACCEPT
-A INPUT -i enp2s0 -p icmp -m icmp --icmp-type 3 -j ACCEPT
-A INPUT -i enp2s0 -p icmp -m icmp --icmp-type 11 -j ACCEPT
-A INPUT -i enp2s0 -p icmp -j DROP
-A INPUT -i enp2s0 -p tcp -m tcp --tcp-flags FIN,SYN,ACK SYN -j REJECT --reject-with icmp-port-unreachable
-A FORWARD -o enp2s0 -p tcp -j DROP
-A OUTPUT -o enp2s0 -p tcp -m tcp --dport 47050 -j lim1
-A OUTPUT -o enp2s0 -p tcp -m tcp --dport 48050 -j lim1
-A OUTPUT -o enp2s0 -p tcp -m tcp --dport 47050 -j ACCEPT
-A OUTPUT -o enp2s0 -p tcp -m tcp --dport 48050 -j ACCEPT
-A OUTPUT -o enp2s0 -p icmp -j ACCEPT
-A lim1 -m limit --limit 50/sec -j RETURN
-A lim1 -j DROP
COMMIT

*raw
:PREROUTING ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
COMMIT

*nat
:PREROUTING ACCEPT [0:0]
:INPUT ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
COMMIT

*security
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
COMMIT

*mangle
:PREROUTING ACCEPT [0:0]
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
COMMIT

I tried to add different rules, but all no results.
Vsftpd configs.

listen=YES
listen_ipv6=NO
anonymous_enable=NO
local_enable=YES
write_enable=YES
local_umask=022
dirmessage_enable=YES
use_localtime=YES
xferlog_enable=YES
connect_from_port_20=YES
chroot_local_user=YES
allow_writeable_chroot=YES
pasv_enable=YES
pasv_max_port=40050
pasv_min_port=40000
secure_chroot_dir=/var/run/vsftpd/empty
pam_service_name=vsftpd
rsa_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem
rsa_private_key_file=/etc/ssl/private/ssl-cert-snakeoil.key
ssl_enable=NO

Please help in the adjustment of my rules, since I do not have the competence Thank in advance.

Answer 1

Add the following rule ABOVE the line -A INPUT -i enp2s0 -p tcp -m tcp --tcp-flags FIN,SYN,ACK SYN -j REJECT --reject-with icmp-port-unreachable:

-A INPUT -i enp2s0 -p tcp -m multiport --dports 20,21 -j ACCEPT

What's happening is your ACCEPT rules for the specific TCP ports do not include the default FTP ports of 20 and 21, and the packet is traversing the INPUT chain until it matches against the line noted above with the icmp-port-unreachable, hence your issue.

Additionally, you can combine all of the TCP ACCEPT rules to be the following one-liner:

-A INPUT -i enp2s0 -p tcp -m multiport --dports 20,21,22,80,47050,48050 -j ACCEPT

Hope this helps