WebServer on EC2 returns 503/404/nothing

Question

I have a Linux EC2 instance. Apache in installed and up, so when I'm ssh'ed to my instance and do

curl localhost

I see a webpage served by my Apache. But when I try to access this page by URL (like http://ec2-xx-xx-xx-xx.eu-west-1.compute.amazonaws.com ) I get back only 503 error page on one Internet connection, 404 error page on other connection. access_log and error_log show no activity when I try to access the server by URL. I'm stuck. Please give me some tips how to solve this issue.

Answer 1

I guess missing logs on local hint us that http error messages returned by amazonaws.com itself not from your Apache server. Did you set the security for port TCP 80? ssh port is open as default but I am not sure for port 80

Answer 2

I fixed this by turning iptables off. So firewall was the problem. Thank you guys for help.