Why DigitalOcean is flushing iptables on restart?

Why Digital Ocean is flushing iptables on restart? i add firewall rule and save wanted to test if it works on restart ooops !!! when i restart iptables service it is flushing…

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Hi. Our team does not have any direct access to your droplet’s internals once you’ve created the droplet. We do not make any changes within any users droplets apart from the root password reset tool which is fully automated.

iptables does not save records automatically on reboot. You can find more details as well as an example of how to implement automatic loading of your rules on boot here.

The iptables “save” function must be accompanied by an iptables “restore” on boot.