Amazon ssh 访问“权限被拒绝（公钥）”问题

<p>如何通过 ssh 连接到 Amazon 实例？<br /> 我有：</p> <ol> <li>在 Amazon 注册；</li> <li>在 Amazon 网站上创建公钥和证书并保存到磁盘；</li> <li>进入我的控制台并创建环境变量；</li> <li>$ export JAVA_HOME=/usr/lib/jvm/java-6-openjdk/</li> <li>$ export EC2_CERT=/home/default/aws/cert-EBAINCRNWHDSCWWIHSOKON2YWGJZ5LSQ.pem</li> <li>$ export EC2_PRIVATE_KEY=/home/default/aws/pk-EBAINCRNWHDSCWWIHSOKON2YWGJZ5LSQ.pem</li> <li>告诉 Amazon API使用该密钥对，并将密钥对保存到文件:</li> <li>$ ec2-add-keypair ec2-keypair &gt; ec2-keypair.pem</li> <li>使用以下密钥对启动 Amazon Ubuntu 9 实例：</li> <li>$ ec2-run-instances ami-ed46a784 -k ec2-keypair</li> <li>尝试建立到实例的 ssh 连接：</li> <li>$ ssh -v -i ec2-keypair.pem ubuntu@ec2-174-129-185-190.compute-1.amazonaws.com</li> <li>OpenSSH_5.1p1 Debian-5ubuntu1, OpenSSL 0.9.8g 19 Oct 2007</li> <li>debug1: Reading configuration data /etc/ssh/ssh_config</li> <li>debug1: Applying options for *</li> <li>debug1: Connecting to ec2-174-129-185-190.compute-1.amazonaws.com [174.129.185.190] port 22.</li> <li>debug1: Connection established.</li> <li>debug1: identity file ec2-keypair.pem type -1</li> <li>debug1: Remote protocol version 2.0, remote software version OpenSSH_5.1p1 Debian-5ubuntu1</li> <li>debug1: match: OpenSSH_5.1p1 Debian-5ubuntu1 pat OpenSSH*</li> <li>debug1: Enabling compatibility mode for protocol 2.0</li> <li>debug1: Local version string SSH-2.0-OpenSSH_5.1p1 Debian-5ubuntu1</li> <li>debug1: SSH2_MSG_KEXINIT sent</li> <li>debug1: SSH2_MSG_KEXINIT received</li> <li>debug1: kex: server-&gt;client aes128-cbc hmac-md5 none</li> <li>debug1: kex: client-&gt;server aes128-cbc hmac-md5 none</li> <li>debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024&lt;1024&lt;8192) sent</li> <li>debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP</li> <li>debug1: SSH2_MSG_KEX_DH_GEX_INIT sent</li> <li>debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY</li> <li>debug1: Host ‘ec2-174-129-185-190.compute-1.amazonaws.com’ is known and matches the RSA host key.</li> <li>debug1: Found key in /home/default/.ssh/known_hosts:11</li> <li>debug1: ssh_rsa_verify: signature correct</li> <li>debug1: SSH2_MSG_NEWKEYS sent</li> <li>debug1: expecting SSH2_MSG_NEWKEYS</li> <li>debug1: SSH2_MSG_NEWKEYS received</li> <li>debug1: SSH2_MSG_SERVICE_REQUEST sent</li> <li>debug1: SSH2_MSG_SERVICE_ACCEPT received</li> <li>debug1: Authentications that can continue: publickey</li> <li>debug1: Next authentication method: publickey</li> <li>debug1: Trying private key: ec2-keypair.pem</li> <li>debug1: read PEM private key done: type RSA</li> <li>debug1: Authentications that can continue: publickey</li> <li>debug1: No more authentication methods to try.</li> <li>权限被拒绝（公钥）。</li> </ol> <p>可能存在什么问题以及如何使其工作？</p>