Why do I need to open the port again when I restart the server?

Question

iptables

Opened the port using the iptables -I INPUT -p tcp -m tcp --dport 1111 -j ACCEPT command, but when the server is rebooted, you need to enter this command again.
Why is this happening and how to fix it?

Answer 1

iptables does not save settings on shutdown.
Google autosave iptables settings. There are a couple of lines to enter.