How to make backend server hosted by Ubuntu Server VM (hosted with Prxmox) accessible from public network?

I have set up a yaml file in folder '/etc/netplan' following the template:

network:  version: 2  ethernets:    eth0:      dhcp4: false      addresses:        - my public ip from 'curl ipinfo.io/ip'      gateway4: my gateway ip from 'ip route | grep default', e.g. it is 192.168.1.1 for log "default via 192.168.1.1 dev eth0"      nameservers:        addresses:          - 8.8.8.8          - 8.8.4.4

Also, I have set my nginx as

server {    listen 80;    server_name my_public_ip;    location / {        proxy_pass http://127.0.0.1:8000;        proxy_set_header Host $host;        proxy_set_header X-Real-IP $remote_addr;        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;        proxy_set_header X-Forwarded-Proto $scheme;    }}

I am sure my FastAPI server (hosted with Gunicorn and Nginx) works when I change the "my_public_ip" to the private IP address ('192.168.50.136') shown in VM summary page of the Proxmox UI.

I am still not able to send a request to my running server "my_public_ip_addr:80" ;_;

This is the summary of my Ubuntu 24.04 Server Virtual Machine

Proxmox Setting ImageThe first IP is my public ip from 'curl ipinfo.io/ip'.

Do I need to create another Network -> Linux Bridge? e.g. another CIDR, Gateway etc...

I am new to this, can anyone please help? Thank you!

I didnt setup ufw firwall

sudo ufw statusStatus: inactive