Как включить в iptables исходящие соединения из приложения, работающего в Ubuntu на удалённые серверы и общение с ними?

#!/bin/sh
# Flush rules and delete custom chains
iptables -F
iptables -X

# Define chain to allow particular source addresses
iptables -N chain-incoming-ssh
iptables -A chain-incoming-ssh -j ACCEPT

# Define chain to allow particular services
iptables -N chain-outgoing-services
iptables -A chain-outgoing-services -p tcp --dport 53 -j ACCEPT
iptables -A chain-outgoing-services -p udp --dport 53 -j ACCEPT
iptables -A chain-outgoing-services -p tcp --dport 123 -j ACCEPT
iptables -A chain-outgoing-services -p udp --dport 123 -j ACCEPT
iptables -A chain-outgoing-services -p tcp --dport 80 -j ACCEPT
iptables -A chain-outgoing-services -p tcp --dport 443 -j ACCEPT
iptables -A chain-outgoing-services -p tcp --dport 22 -j ACCEPT
iptables -A chain-outgoing-services -p tcp --dport 3306 -j ACCEPT
iptables -A chain-outgoing-services -p tcp --dport 5000 -j ACCEPT
iptables -A chain-outgoing-services -p tcp --dport 8336 -j ACCEPT
iptables -A chain-outgoing-services -p icmp -j ACCEPT
iptables -A chain-outgoing-services -j DROP

# Define chain to allow established connections
iptables -N chain-states
iptables -A chain-states -p tcp -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
iptables -A chain-states -p udp -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
iptables -A chain-states -p icmp -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
iptables -A chain-states -j RETURN

# Drop invalid packets
iptables -A INPUT -m conntrack --ctstate INVALID -j DROP

# Accept everything on loopback
iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT

# Accept incoming/outgoing packets for established connections
iptables -A INPUT -j chain-states
iptables -A OUTPUT -j chain-states

# Accept incoming ICMP
iptables -A INPUT -p icmp -j ACCEPT

# Accept incoming SFTP
#iptables -A INPUT -p sftp -j ACCEPT

# Accept incoming SSH
iptables -A INPUT -p tcp --dport ssh -j chain-incoming-ssh

# Accept incoming HTTP
iptables -A INPUT -p tcp -m tcp --dport http --syn -j ACCEPT

# Accept incoming HTTPS
iptables -A INPUT -p tcp -m tcp --dport https --syn -j ACCEPT

# Accept incoming MySQL
iptables -A INPUT -p tcp -m tcp --dport 3306 -j ACCEPT

# Accept incoming ASP.NET Core App
iptables -A INPUT -p tcp -m tcp --dport 5000 -j ACCEPT


# Accept outgoing
iptables -A OUTPUT -j chain-outgoing-services

## Drop everything else
iptables -P INPUT DROP
iptables -P FORWARD DROP
iptables -P OUTPUT DROP