I have started a Amazon EC2 instance (Linux Redhat)... And Apache as well.

But when i try:

http://MyPublicHostName

I get no response.

I have ensured that my Security Group allows access to port 80.
I can reach port 22 for sure, as i am logged into the instance via ssh.
Within the Amazon EC2 Linux Instance when i do:
$ wget http://localhost
i do get a response. This confirms Apache and port 80 is indeed running fine.

Since Amazon starts instances in VPC, do i have to do anything there... Infact i cannot even ping the instance, although i can ssh to it!

Any advice?

EDIT:
Note that i had edited /etc/hosts file earlier to make 389-ds (ldap) installation work.

My /etc/hosts file looks like this(IP addresses as shown as w.x.y.z )
127.0.0.1   localhost.localdomain localhost
w.x.y.z   ip-w-x-y-z.us-west-1.compute.internal
w.x.y.z   ip-w-x-y-z.localdomain