SSH a EC2 pero obtiene permiso denegado (clave pública)

Question

Genere el par de claves por EC2-Console y luego guárdelo en ~/.ssh/iForests_ABetADay.pem.
Después de eso, chmod 400 iForests_ABetADay.pem, y ssh -i iForests_ABetADay.pem ubuntu@46.51.244.48 -v.
me conecto ayer, pero ahora el mensaje de error que tengo es:
(Google mucho, pero todavía no puedo encontrar una manera de resolverlo ...)

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). 

Answer 1

La salida muestra claramente que está intentando la clave incorrecta. Le sugiero que consulte

~/.ssh/config 
/etc/ssh/ssh_config 
/etc/ssh_config 

para ver si hay algo que obliga a su cliente para utilizar iForests_ABetADay.pem. De acuerdo con el registro, debe ser /etc/ssh_config.