Last update at ：2024-07-10，Edit by888u
1. Turn on the firewall
sudo ufw enable
2. Restart the firewall
sudo ufw reload
3. Open the desired port (such as 9000)
ufw allow 9000
4. Close a certain port (such as 9000)
ufw delete allow 9000
5. Check the local port usage
ufw status
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