kameoka-no-MacBook-Pro:~ keita$ ssh -v -v ec2-user@ec2-52-68-137-132.ap-northeast-1.compute.amazonaws.com -i $HOME/Desktop/id_rsa_15jn03_aws
OpenSSH_6.2p2, OSSLShim 0.9.8r 8 Dec 2011
debug1: Reading configuration data /etc/ssh_config
debug1: /etc/ssh_config line 20: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to ec2-52-68-137-132.ap-northeast-1.compute.amazonaws.com [52.68.137.132] port 22.
debug1: Connection established.
debug1: identity file /Users/keita/Desktop/id_rsa_15jn03_aws type -1
debug1: identity file /Users/keita/Desktop/id_rsa_15jn03_aws-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.2
ssh_exchange_identification: read: Connection reset by peer

色々ググったのですが、どうやらサーバー側で弾かれているという事と、
ログイン、アウトを何回か繰り返した事が原因かな？　と考えてます