![]() It’s the most dangerous step as you can lock yourself out very easily, so make sure you have set up rules allowing SSH rules first, and also check that alternative routes are working (e.g. Regarding the initial ufw enable I know there a warning, but it needs more emphasis. Putting it first avoids the rule being skipped because (for example) other rules allow access to port 22 or 80 that attacks are hitting. That gets you automatic rate limiting for new connections to your SSH port, a useful defence against brute-forcing.Ī useful thing if you simply want to block an inbound IP completely is ufw insert 1 deny from. I’d suggest recommending ufw limit "OpenSSH" as the way to enable ssh access. mosh, FTP), and using the app names makes them far more readable. Most of the time services are just single ports on single protocols, but they’re not always (e.g. I’d recommend preferring the app definitions over port numbers. Great article, but I have a few suggestions to make it a bit safer. The following command will enable the OpenSSH UFW application profile and allow all connections to the default SSH port on the server: When working with remote servers, you’ll want to make sure that the SSH port is open to connections so that you are able to log in to your server remotely. Remember you can list all available application profiles with sudo ufw app list. If you’d want to only allow HTTPS requests from and to your web server, you’d have to first enable the most restrictive rule, which in this case would be Nginx HTTPS, and then disable the currently active Nginx Full rule: This output indicates that the Nginx Full application profile is currently enabled, allowing any and all connections to the web server both via HTTP as well as via HTTPS.
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