ssh -i <mypemfile.pem> ubuntu@<my-ip-address>

connection closed by <my-ip-address>

ssh -v -i <mypemfile.pem> ubuntu@<my-ip-address>

OpenSSH_6.6.1, OpenSSL 1.0.1m 19 Mar 2015
debug1: Connecting to 52.88.36.194 [52.88.36.194] port 22.
debug1: Connection established.
debug1: identity file instacare.pem type -1
debug1: identity file instacare.pem-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.6.1
debug1: Remote protocol version 2.0, remote software version OpenSSH_6.6.1p1 Ubu
ntu-2ubuntu2
debug1: match: OpenSSH_6.6.1p1 Ubuntu-2ubuntu2 pat OpenSSH_6.6.1* compat 0x04000
000
debug1: SSH2_MSG_KEXINIT sent
Connection closed by 52.88.36.194

SSH-2.0-OpenSSH_6.6.1p1 Ubuntu-2ubuntu2