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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Privileged ports can be used by processes that are running without root permissions. So if the sshd process would crash or stop for some other reason, any malicious user process could pretend to be the real ssh server without privilege escalation. To be fair this isn't really a concern for single user systems. But setting up fail2ban or only making ssh accessible from a local network or VPN would probably be a more helpful hardenening step
And regarding port 2222 it is the most popular non-provileged port used for SSH according to shodan.io So you ain't gaining much obscurity
I guess you mean unprivileged ports?
Not really, except on the very first connection because you need access to the root-owned and otherwise inaccessible SSH host key, otherwise you'll get the message a lot of people have probably seen after they reinstalled a system (something like "SOMEONE MIGHT BE DOING SOMETHING VERY NASTY!").