aws, elastic , can not connect to express port

the default aws port are 80,443 and 222, and the default port of express is 3000.


sudo iptables -A INPUT -p tcp --dport 3000 -j ACCEPT

ubuntu ufw, firewall

sudo apt-get install ufw

sudo ufw status verbose

sudo ufw status

sudo ufw disable
sudo ufw enable

sudo ufw default deny incoming

sudo ufw default allow outgoing

sudo ufw allow ssh

Disable and enable ufw to apply the changes:

sudo ufw disable
sudo ufw enable

kill application , linux

kill process

ps -aux | grep NAME

pkill -f NAME

Kill by pid

kill -9 <pid>

清理所有temp

cd /tmp/

rm -rf *

find process by port

ps -fp 1289

lsof -t -i:3000