Fail2Ban Not Automatically Ban IP After Several Failed Login Attempts
I have set up a droplet running on Ubuntu 18.04. Everything including my websites on WordPress is working perfectly. But as I read on many blogs regarding hardening server security, then, I tried to install Fail2Ban. Installation is successful and jail is created. But when I tried to enter the wrong password, it does not ban my IP. I have tried all tutorials below but still cannot automatically ban my IP on failed SSH login attempts. Is there somewhere I missed which makes me unable to automatically ban my IP?
Below is additional info if it helps.
Firewall: DigitalOcean Firewall & UFW.
SSH Connection: Putty.
SSH Login: Using key pairs.
SSH Password login: Disabled.
Root login: Disabled.
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