EC2's EIP port 443 not working

Hi everyone,

I have an EC2 instance with Ubuntu and an attached Elastic IP (EIP), and services running on ports 443 and 3000. The security group settings are as follows:

Port range	Protocol	Source
22	TCP	10.0.0.0/8
3000	TCP	10.0.0.0/8
443	TCP	0.0.0.0/0

The problem is that when I use telnet to test the ports, for example:

$ telnet internal IP:22 or $ telnet to the internal IP:3000, it works fine.

However, when I try to $ telnet EIP:443, it fails and returns a connection refused error.

When I try $ telnet internal IP:443, it works fine.

But the security group is configured with 0.0.0.0/0. Why can't I telnet to the EIP on port 443?

BTW, the ufw is inactive, and don't have iptables, Network ACL as follow:

Rule number	Type	Protocol	Port range	Source	Allow/Deny
100	All traffic	ALL	ALL	0.0.0.0/0	Allow
*	All traffic	ALL	ALL	0.0.0.0/0	Deny