I'm able to SSH into my EC2 instance without any issues, and my Docker container is running perfectly with my FastAPI app responding to requests from localhost. However, I'm unable to access the application through the public IP address directly, whether it's just the IP or [http://public_ip:8000](http://public_ip:8000). I've confirmed that the public IPv4 is assigned, the security group allows inbound traffic, and I've reviewed the Network ACL, but requests are timing out. I've even tested with different ISPs and it still didn't work. To troubleshoot, I checked the network path to the instance and it seems fine, but it fails specifically when trying to access port 8000. Any ideas on what's going wrong?
3 Answers
Have you tried accessing your app using HTTPS? It could make a difference. Also, you might want to double-check that your Network ACL is properly configured, especially since it seems like it's not a default one. Just a heads up, ephemeral port rules can mess things up if they're not set right.
Start from scratch if you can. Try running a simple container that listens on port 80 and see if that works. Checking both your security group settings and Network ACLs is important, as well as ensuring the subnet has internet connectivity.
It sounds like this might be a security group issue. Double-check that your security group allows connections to port 8000 from [0.0.0.0/0]. Also, if possible, consider setting up Nginx to handle requests on ports 80 and 443 and redirect them to your Docker container on port 8000.
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