I cannot access EC2 443 port from outside through public ip

Question

I created two EC2 VMs on Amazone cloud, and have public IPs for each VM. However I cannot access 443 port from outside through public IP of EC2 VM.

• The following case is okay. on one EC2 VM (VM1): "nc -l 443" on another EC2 VM (VM2): I can use "nc 443" connect with VM1 successfully. on another EC2 VM (VM2): I can use "nc 443" connect with VM1 successfully.

• the following case is NOT okay. on VM1: "nc -l 443" on my personal computer (outside of Amazon cloud): use "nc 443" --> timeout!! I can use ssh logon VM1 successfully from my personal computer!

• I did check the network security group and network ACL. network security group, I added 443 rule. network ACL is default, all traffic is allowed.

Anyone has any idea??? thanks!!