1
Không thể mở cổng trên Ubuntu Server
root@server:~# ufw allow 83973/tcp Rules updated Rules updated (v6) root@server:~# sudo ufw status verbose Status: inactive root@server:~# sudo ufw enable Command may disrupt existing ssh connections. Proceed with operation (y|n)? y Firewall is active and enabled on system startup root@server:~# sudo ufw status verbose Status: active Logging: on (low) Default: …