Connect 2 AWS EC2 Free Tier instances

I'd like to try the AWS free tier program before scaling up if all goes well. I created 2 AWS free tier accounts, each one has an EC2 instance and they are both in the same Availability zone. Now I want to be able to send files thru ftp from one to the other using their private IP addresses in the default VPC (hence avoiding to use my outbound bandwidth) but I cannot manage to get it working. I have created an inbound rule on each one to accept all traffic from the other but I cannot telnet the port 21 of the private address where the FTP server is (or any TCP port actually) The ftp server is working fine when I connect to its static public elastic IP address but I'd like to not to have to get out of the VPC network. Any idea?

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