SSH к EC2, но мне отказано в разрешении (открытый ключ)

Я сгенерировал пару ключей с помощью EC2- Консоль, а затем сохраните ее в ~ / .ssh / iForests_ABetADay.pem.
После этого выполните chmod 400 iForests_ABetADay.pem и ssh -i iForests_ABetADay.pem (скрытый) -v.
Вчера я входил в систему, но теперь у меня появляется сообщение об ошибке:
(Гугл много, но все еще не могу найти способ решить эту проблему ...)

OpenSSH_5.6p1, OpenSSL 0.9.8r 8 Feb 2011
debug1: Reading configuration data /etc/ssh_config
debug1: Applying options for *
debug1: Connecting to 46.51.244.48 [46.51.244.48] port 22.
debug1: Connection established.
debug1: identity file iForests_ABetADay.pem type -1
debug1: identity file iForests_ABetADay.pem-cert type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.8p1 Debian-1ubuntu3
debug1: match: OpenSSH_5.8p1 Debian-1ubuntu3 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.6
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-ctr hmac-md5 none
debug1: kex: client->server aes128-ctr hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<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: Host '46.51.244.48' is known and matches the RSA host key.
debug1: Found key in /Users/iforests/.ssh/known_hosts:17
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: iForests_ABetADay.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).