I wanted a secure way to manage the /var/www/ folder. My regular user can’t upload to the /var/www/ folder without using root user account via Filezilla. I normally log in using an ssh key which works fine.

I then followed this guide to create a ftpuser with a password that would manage the /var/www/ folder and also be it’s home directory. It was meant to connect to Filezilla but when i try to connect i get the error:

Error: FATAL ERROR: No supported authentication methods available (server sent: publickey)
Error: Could not connect to server

Article: https://guides.wp-bullet.com/adding-sftp-user-correct-permissions-nginx-php-fpm/

I got up to the finalizing stage.

The only way I can access the ftpuser is via the terminal, where I need to do

su - ftpuser and prompt to enter password. 

uid=1001(ftpuser) gid=33(www-data) groups=33(www-data)

What am I missing?