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i cant open port 80 nor 5000

ABDELFATTAH ZowailJun 28 2025

I’m hosting a Flask app on an Oracle Cloud Always Free Ubuntu VM. The app runs on port 5000, and I’ve added an iptables rule to redirect port 80 to 5000:

bash

CopyEdit

sudo iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 5000

Firewall Configuration:

NSG and Subnet Security List both allow TCP ingress from **0.0.0.0/0** to port 80
UFW also allows port 80
The VM has a public IP, and the route table includes a default route via Internet Gateway

Problem:

Accessing the public IP on port 80 times out (took too long to respond), even though:

Flask works locally on 127.0.0.1:5000
iptables redirect is in place
No other services are using port 80

What might be blocking the traffic?

Added on Jun 28 2025

#networking, #openport, #port, #security, #securityrules, #virtualmachine, #vm

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