Using a domain to connect to the server via FTP instead of the ip.

Hey, so I am running an Ubuntu 16.04 server with vsftpd installed according to this tutorial. Everything works fine and I can upload files using an ftp client.

However I would like to use one of my domains instead of the IP in the ftp client to connect to the server.

I am using the digital ocean name server with basically all default settings. My domain points to the server IP.

On my server I am running docker and an nginx proxy. This proxy redirects the incoming traffic to an upstream e.g. a nodejs server (also docker).

The nginx config is the following:

server {
    server_name ~. ;
    listen 80;
    listen [::]:80;
    # config for .well-known
    include /etc/nginx/includes/letsencrypt.conf;

    location / {
        return         301 https://$host$uri;
    }
}

# Redirect all www to non-www
#
server {
    listen 80;
    listen [::]:80;
    server_name "~^www\.(.*)$" ;
    return 301 https://$1$request_uri;
}

# Redirect https www to non-www
#
server {
    listen 443 ssl http2;
    listen [::]:443 ssl http2;
    server_name www.domain.com;
    ssl_certificate /etc/letsencrypt/live/www.domain.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/www.domain.com/privkey.pem;
    return 301 https://domain.com$request_uri;
}
server {
    server_name domain.com;
    ssl_certificate /etc/letsencrypt/live/domain.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/domain.com/privkey.pem;

isten 443 ssl http2;
listen [::]:443 ssl http2;

# access_log
access_log            /var/log/nginx/access.log;
# proxy_pass config
location / {
    # include proxy presets
    include /etc/nginx/includes/proxy.conf;
    proxy_pass              http://upstream$uri;
}
# general ssl parameters
include /etc/nginx/includes/ssl-params-with-preload.conf;

root         /var/www/html;
}

I am using the suggested FTP with SSL method in my ftp client.

Any idea what I am doing wrong? Thanks.