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AWS EC2 Connection closed by when trying ssh into instance

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recently I set up a new EC2 instance. The next day I was not able to connect to my instance via ssh. I could connect and disconnect the day before, I swear I did nothing. here is ssh debug info:

ssh -i webserver.pem -v [email protected]
OpenSSH_5.9p1, OpenSSL 0.9.8r 8 Feb 2011
debug1: Reading configuration data /etc/ssh_config
debug1: /etc/ssh_config line 20: Applying options for *
debug1: Connecting to my.elastic.ip [my.elastic.ip] port 22.
debug1: Connection established.
debug1: identity file webserver.pem type -1
debug1: identity file webserver.pem-cert type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.9p1 Debian-5ubuntu1.1
debug1: match: OpenSSH_5.9p1 Debian-5ubuntu1.1 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.9
debug1: SSH2_MSG_KEXINIT sent
Connection closed by my.elastic.ip

Is there a way to resolve this issue? Or shall I reinstall my instance again? Please, help as I need to resolve this asap. Your help is highly appreciated!

PS rights to my .pem are set to 600.

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