AWS is request timeout for ping

By default AWS does not enable the ICMP protocol.  If you want your instance to be ping-able you will need to add the ICMP service just as you did the HTTP, SSH, etc services.  On the Security Groups page you need to add the ICMP rule to your security group.  Or you can run the command line as found on this page:

http://stackoverflow.com/questions/1465076/how-to-access-ping-a-server-located-on-aws