There were 445 failed login attempts since the last successful login.

I just create a new droplet a few minutes ago, I installed nginx and setup SSH keys to conect through PuTTY, and for my surprise when I login in my SSH Console, in the message I get:

“There were 445 failed login attempts since the last successful login.”

It is very strange to me, I create my droplet a few minute ago, It will be any hacker with bruteforce trying a invasion??

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Yes, bruteforcing SSH is very common. Disable password authentication and use public keys.

Sounds like you should take care of a few things. If you are using SSH keys, remove password login. Then install Fail2ban.

in /etc/ssh/sshd_config change the following lines so they match this: ChallengeResponseAuthentication no PasswordAuthentication no

Then follow the steps in the “Configuring a Basic Firewall” section here -

Then install Fail2ban -

This is all assuming you are using Ubuntu 14.04