I have an Nginx server in EC2. It's in a VPC on a public subnet that's attached to an internet gateway. The security group is configured to allow traffic on port 80 and 443. The instance is running on Ubuntu 24.04 in AWS.
From a tcpdump, I can see that the server is receiving traffic on port 80 for both the private and public IPs, but only the private IP returns results.
For testing, I've disabled the ufw:
$ sudo ufw status Output:
Status: inactive
tcpdump
sudo tcpdump -i any port 80 Output:
tcpdump: data link type LINUX_SLL2 tcpdump: verbose output suppressed, use -v[v]... for full protocol decode listening on any, link-type LINUX_SLL2 (Linux cooked v2), snapshot length 262144 bytes 18:45:57.854950 ens5 In IP .8298 >
Nginx config
I am very new to Nginx and just trying to get a basic system setup at this point, so I'm using the default configuration until I can get the public IP working. I want to work through one issue at a time.
server { listen 80 default_server; listen [::]:80 default_server; root /var/www/html; index index.html index.htm index.nginx-debian.html; server_name _; location / { try_files $uri $uri/ =404; } } Private IP Curl
$ curl http://<private_ip>/ Output:
<!DOCTYPE html> <html> <head> <title>Welcome to nginx!</title> <style> html { color-scheme: light dark; } body { width: 35em; margin: 0 auto; font-family: Tahoma, Verdana, Arial, sans-serif; } </style> </head> <body> <h1>Welcome to nginx!</h1> <p>If you see this page, the nginx web server is successfully installed and working. Further configuration is required.</p> <p>For online documentation and support please refer to <a href="http://nginx.org/">nginx.org</a>.<br/> Commercial support is available at <a href="http://nginx.com/">nginx.com</a>.</p> <p><em>Thank you for using nginx.</em></p> </body> </html> Public IP Curl
$ curl http://<public_ip> curl: (28) Failed to connect to <public_ip> port 80 after 75010 ms: Couldn't connect to server
