this post was submitted on 10 Nov 2023
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Have I successfully blocked ssh logins to root? (lemmy.ml)
submitted 1 year ago by cyberwolfie@lemmy.ml to c/linux@lemmy.ml
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I have a server where I believe I have disabled root login via ssh. I think it is done correctly, as I cannot login with root myself via ssh, but I would've thought that it would be reflected in /var/log/auth.log. Instead, it shows up as failed password entry. Is this intended?

What I've done is to uncomment the PermitRootLogin no line in /etc/ssh/sshd_config. Rest of the config file is left at default.

Bonus question: All login attempts by ssh seems to go over some random port (even my own successful logins). Why is this?

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[–] grant@toast.ooo 2 points 1 year ago (1 children)

It’s recommended you keep the default port because as soon as your IP is known it takes less than 5 minutes to scan every port for an ssh port

[–] cyberwolfie@lemmy.ml 1 points 1 year ago

It’s recommended you keep the default port because as soon as your IP is known it takes less than 5 minutes to scan every port for an ssh port

Fair point! I first thought that would be good, as it would discourage all those random connections. My guess is that they won't bother spending 5 minutes on each server, and instead just move on to the next when they fail. But then I realized that I don't really care about those anyway as they're not getting anywhere with their root:mypassword login attempts.