I’m getting many connections from Digital Ocean IP addresses trying to connect to my SSH port and trying to access non-existent locations on my webserver. I’m blocking them all at my firewall. Are there any IPs used by Digital Ocean that I should not block?

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Hello, @edGiantSquid

There is no specific IP address that you should whitelist. You can block every IP address that makes unsuccessful ssh authentication as this is clearly not a legit traffic.

You can also look into changing the ssh port and make only the pubkey authentication is enabled leaving the password authentication disabled in order to keep things safe. Also make sure everything on the droplet is updated and you’ve blocked/closed all the ports which are not used.

Brute force login attacks are one of the most common ways for a server to be compromised. This tutorial shows you how:

Hope that helps!

Regards,
Alex

by Justin Ellingwood
SSH, or secure shell, is the most common way of administering remote Linux servers. Although the daemon allows password-based authentication, exposing a password-protected account to the network can open up your server to brute-force attacks. In this guide, we demonstrate how to configure your server with SSH keys, which is the recommended authentication method. These are much more difficult for attackers to work around, giving you a more secure login mechanism.
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