Myujth

I have configured .net and nginx on ubuntu and it works in local web perfectly. I have static external ip, I have configured port forwarding on my router (I had done it for postgresql and it works fine from external web so I think I have done it properly) When it comes to nginx and when i type my ip f.e: xx.xx.x.xx:80 in url on computer in another web site is unreachable.

I have opened ports in firewall on linux:

sudo apt-get install ufw
sudo ufw allow 22/tcp
sudo ufw allow 80/tcp
sudo ufw allow 443/tcp

sudo ufw enable

Here is my nginx config:

server 
 listen 80;
 server_tokens off;

 location / 
 proxy_pass http://localhost:5000;
 proxy_http_version 1.1;
 proxy_set_header Upgrade $http_upgrade;
 proxy_set_header Connection keep-alive;
 proxy_set_header Host $host;
 proxy_cache_bypass $http_upgrade;
 

I hope, I find solution but still I don't know why it works this way. I have changed listen port to 9000 or any different instead 80 in nginx config and in my router forwarding. Now everything works fine, why port 80 does not work?