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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 am sure I did nothing. Here is ssh debug info: ssh -i webserver.pem -v ubuntu@my.elastic.ip 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? PS rights to my .pem are set to 600.

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