DO marketplace Mastodon image - what firewall?

setting up the DO (digital ocean) marketplace image for mastodon; does anyone know what firewall it uses by default? it runs ubuntu 18.04.

“ufw status” produces ‘inactive’.
i checked and SEL isn’t active / enforced either.

when i change the ssh port, and restart it, i can no longer access it remotely. so which is it?

Thanks for your help.

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