No se puede conectar SSH al servidor después de la actualización de OpenSSH

No se puede conectar SSH al servidor después de la actualización de OpenSSH

Uno de mis desarrolladores se ha encargado de actualizar uno de nuestros servidores de producción sin respaldo a OpenSSH 6.2p, este servidor es un Ubuntu Box ejecutándose en EC2, y ahora no podemos utilizar SSH. Aquí hay un registro de salida de SSH. dominio.

ssh -i ~/Security/microsites_lamp.pem [email protected] -v
OpenSSH_6.2p2, OSSLShim 0.9.8r 8 Dec 2011
debug1: Reading configuration data /Users/justin/.ssh/config
debug1: Reading configuration data /etc/ssh_config
debug1: /etc/ssh_config line 20: Applying options for *
debug1: Connecting to our.ip.address.here [our.ip.address.here] port 22.
debug1: Connection established.
debug1: identity file /Users/justin/Security/microsites_lamp.pem type -1
debug1: identity file /Users/justin/Security/microsites_lamp.pem-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.2
debug1: Remote protocol version 2.0, remote software version OpenSSH_6.7
debug1: match: OpenSSH_6.7 pat OpenSSH*
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-ctr [email protected] none
debug1: kex: client->server aes128-ctr [email protected] none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<2048<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Server host key: RSA <RSA_FINGERPRINT_HERE>
debug1: Host 'our.ip.address.here' is known and matches the RSA host key.
debug1: Found key in /Users/justin/.ssh/known_hosts:20
debug1: ssh_rsa_verify: signature correct
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: Roaming not allowed by server
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey
debug1: Next authentication method: publickey
debug1: Trying private key: /Users/justin/Security/microsites_lamp.pem
debug1: read PEM private key done: type RSA
debug1: Authentications that can continue: publickey
debug1: No more authentication methods to try.
Permission denied (publickey).

Me he asegurado de que el archivo PEM tenga los permisos correctos y que el servidor esté funcionando, pero ahora estoy atascado, ¿hay algo que se pueda hacer?

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