domain.conf

server {
    listen 443 ssl;
    server_name domain.synology.me 192.168.11.10;

    location / {
        proxy_pass          https://192.168.11.10:5001;
        proxy_set_header    X-Real-IP           $remote_addr;
        proxy_set_header    Host                $host;
        proxy_set_header    X-Forwarded-For     $proxy_add_x_forwarded_for;
    }
}

nginx.conf

user  mrsmith staff;
worker_processes  1;

events {
    worker_connections  1024;
}

http {
    include       mime.types;
    include       /usr/local/etc/nginx/servers/usenet.conf;
    include       /usr/local/etc/nginx/servers/domain.conf;
    default_type  application/octet-stream;

    sendfile        on;

    keepalive_timeout  65;
}

usenet.conf

    server {
        listen       80 default_server;
        listen       [::]:80 default_server;
        server_name  myvery.owndomain.com 192.168.13.10;

        return 301 https://$server_name$request_uri;
    }

    server {
        listen 443 ssl; # managed by Certbot
        ssl_certificate /etc/letsencrypt/live/myvery.owndomain.com/fullchain.pem; # managed by Certbot
        ssl_certificate_key /etc/letsencrypt/live/myvery.owndomain.com/privkey.pem; # managed by Certbot
        include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
        ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot
        server_name  myvery.owndomain.com 192.168.13.10;

        location /web {
            # serve the CSS code
            proxy_pass          http://127.0.0.1:32400;
            proxy_set_header    X-Real-IP           $remote_addr;
            proxy_set_header    Host                $host;
            proxy_set_header    X-Forwarded-For     $proxy_add_x_forwarded_for;
        }

        location /plex {
            # proxy request to plex server
            proxy_pass http://127.0.0.1:32400/web;
        }

        location /sab {
            proxy_pass http://127.0.0.1:9080;
        }

        location /sonarr {
            proxy_pass          http://127.0.0.1:8989;
            proxy_set_header    X-Real-IP           $remote_addr;
            proxy_set_header    Host                $host;
            proxy_set_header    X-Forwarded-For     $proxy_add_x_forwarded_for;
            proxy_set_header    X-Forwarded-Proto   $scheme;
            proxy_redirect      off;
            proxy_buffering     off;
        }

        location /radarr {
            proxy_pass          http://127.0.0.1:7878;
            proxy_set_header    X-Real-IP           $remote_addr;
            proxy_set_header    Host                $host;
            proxy_set_header    X-Forwarded-For     $proxy_add_x_forwarded_for;
            proxy_set_header    X-Forwarded-Proto   $scheme;
            proxy_redirect      off;
            proxy_buffering     off;
        }

        error_page 404 /404.html;
            location = /40x.html {
        }

        error_page 500 502 503 504 /50x.html;
            location = /50x.html {
        }
    }