How to access Azure ubantu http 80 port?

Question

I use "flask run -p 80" to start a python web api in Azure ubantu 22.

1. I use curl to test it successfully in VM

2. I open firewall for 80

3. I also add security rule for azure NSG, it test successfully.

But I can not access the flask 80 portal use my local browser. Please help to advice what i need to do next? Thanks so much!

Answer 1

How to access Azure ubuntu http 80 port? I have followed the methods below to run the application on port 80 in the Ubuntu VM

Note: For testing I deployed NGINX

Check if your application is listening on the correct port 8080 for the foreign Address 0.0.0.0:* by using below command. If not, you could find what's IP of the application consumed.

 #Install nettools
sudo apt install net-tools
sudo netstat -alpn | grep LISTEN

Output:

When I try with 8080, it's not working, but it's working with 80 as below.

NSG Rules

Make sure to add the same port in the NSG as the port that is listening on the VM

When I try to access the application hosted on the Ubuntu VM using the public IP with port 80, it starts working as below.

20.56.41.235:80

If still not working disable the local firewall on Ubuntu VM by using the command below.

sudo ufw disable