我已经创build了一个基于php cloudformatino图像ami-6fc2f61b的新的ec2实例，并附加了我现有的密钥。 安全组允许ssh和http。 然而，我无法连接：
$ ssh -v -i /cygdrive/c/data/copy/pk.pem ec2_user@host OpenSSH_5.9p1, OpenSSL 0.9.8r 8 Feb 2011 debug1: Connecting to host [46.xx.xx.xx] port 22. debug1: Connection established. debug1: identity file /cygdrive/c/data/copy/pk.pem type -1 debug1: identity file /cygdrive/c/data/copy/pk.pem-cert type -1 debug1: Remote protocol version 2.0, remote software version OpenSSH_5.3 debug1: match: OpenSSH_5.3 pat OpenSSH* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.9 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: Server host key: RSA 44:xx:xx:xx debug1: Host 'host' is known and matches the RSA host key. debug1: Found key in /home/a25058/.ssh/known_hosts:9 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: /cygdrive/c/data/copy/pk.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). 这可能是什么原因？
问题解决了：
我使用了错误的用户名。 试图以root身份login显示以下错误：
Please login as the ec2-user user rather than root user.
显然用户命名约定甚至在亚马逊AMI中也不一致 – 有些使用ec2_user，一些ec2用户。