ssh -i [full path to keypair file] ec2-user@[EC2 instance hostname or IP address]
我做了这个并且之前有效，突然我得到Permission denied（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，我在三个不同的EC2实例中使用相同的密钥。我不确定这是我收到此错误的原因。我可以使用相同的密钥通过ssh访问另外两个EC2实例。但我不能只访问一个实例。
提前致谢
答案 0 :(得分：1)
正确的用户？ ec2-user @或root @