Amazon Internal Network Access via Private IP

You will need to add the following rule to your security group to enable ICMP traffic to the host

Protocol : ICMP
From Port : -1
To Port : -1
Source ( IP or group ) : IP_address/32 ( Change the IP_address to be the IP you want to allow traffic from )

For SAMBA you will need to add rules for the following ports
Port 135/TCP, Port 137/UDP, Port 138/UDP, Port 139/TCP, Port 445/TCP