ssh_exchange_identification: read: Connection reset by peer. My previous session was abnormally closed

I am facing "ssh_exchange_identification: read: Connection reset by peer" error. My previous session was abnormally closed. Now I am not able to connect to my instance.

Any help is highly appreciated. Thank you.

Below is the debug information

ssh -i "aws/githubapi.pem" ubuntu@52.26.94.220 -vv

OpenSSH_6.6.1, OpenSSL 1.0.1f 6 Jan 2014
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to 52.26.94.220 http://52.26.94.220 port 22.
debug1: Connection established.
debug1: identity file aws/githubapi.pem type -1
debug1: identity file aws/githubapi.pem-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.6.1p1 Ubuntu-2ubuntu2
ssh_exchange_identification: read: Connection reset by peer