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Why disable ssh login with root on a server if I only log in with keys, not password?
(sh.itjust.works)
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You can disasble passwords so ONLY keys work, and you can firewall ssh to ONLY IPs you originate from.
Just don't forget to check if your IP has changed if ssh suddenly starts timing out with no error indication no matter what you do and oh god what is actually wrong
I think there's a way to setup an alert for this.
Or use port-knocking.