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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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?
For the limit : basically you need to ask yourself how many connection someone if able to do in a second to your server. As an example, my limit is always 15. A bit high but I'm sure I'm not blocking a legitimate one (either from myself or someone else)
For the ssh port : it's true, but trust me you'll be happy to change for something random like 5927 because you'll have far less bit trying to connect or probe your ip, thus your logs won't be cluttered!
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.