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Selfhosted
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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Phrasing is a bit strange. Does this mean ssh can only be used to login with a key? If so - great!
Since you're using an "app" - not sure there's much we can help you with. The control has been ceded to the maker of said app.
I would normally set up some limits on the firewall and change the ssh port so logs are less polluted, not sure it's possible for you.
Yeah its only possible to login with a key.
What limits would you set on the firewall?
From the bit I've read people usually say changing the ssh port is mostly "security theatre" is this not fully true?
It does not increase security per se but it does limit the amount of bots trying to connect to your server. At least it will make your log a bit less cluttered with random garbage.
Also installing something like fail2ban might be a good idea. Or even better would be to block all ssh connections except from a specific ip address (whitelist). This of course depends whether you can trust your ip to stay the same, or if you can still log in through some other interface if necessary.