I have installed the AEM 6.1 on the Amazon AWS EC2 linux instance, but I cannot access the site using the IP of the instance http://<<host ip>>:4502.
May I know whether there are some additional steps required besides the https://docs.adobe.com/docs/en/cq/5-6-1/getting_started/download_and_startworking.html
I have checked the stdout.log and other logs, and the AEM is started successfully.
As kautuk mentioned, this change must be made to either Default or custom security group that you mapped to your instance.
You will then see -