权限被拒绝（公钥）

Question

ssh -i [full path to keypair file] ec2-user@[EC2 instance hostname or IP address] 

我做到了这一点，它的工作之前，突然间我得到了权限被拒绝（publickey）错误。

mac-pro:aws me$ ssh -i key.pem ubuntu@elastic_ip_address -v 
OpenSSH_5.6p1, OpenSSL 0.9.8r 8 Feb 2011 
debug1: Reading configuration data /etc/ssh_config 
debug1: Applying options for * 
debug1: Connecting to elastic_ip_address [elastic_ip_address] port 22. 
debug1: Connection established. 
debug1: identity file key.pem type -1 
debug1: identity file key.pem-cert type -1 
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.5p1 Debian-4ubuntu4 
debug1: match: OpenSSH_5.5p1 Debian-4ubuntu4 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 'elastic_ip_address' is known and matches the RSA host key. 
debug1: Found key in /Users/me/.ssh/known_hosts:8 
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: key.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). 

顺便说一句，我使用了三个不同的EC2实例相同的密钥。我不确定这是我得到这个错误的原因。我可以使用相同的密钥通过ssh访问另外两个EC2实例。但我不能访问只有一个实例。

在此先感谢

Answer 1

correct user？ ec2-user @或root @