我对编码完全陌生，并且正在 coursera 上开设启动课程：https ://class.coursera.org/startup-001/lecture/87
我在尝试连接到我在 AWS 上创建的 EC2 Ubuntu 实例时收到权限被拒绝（公钥）
- 设置 AWS Istance
- 将安全设置为默认并添加端口 22 并启动
课程告诉我然后输入：
chmod 400 trevor-learning.pem ssh -i trevor-learning.pem \ ec2-user@ec2-XX-XXX-XX-XX.us-west-2.compute.amazonaws.com
然后这给了我这个错误：权限被拒绝（公钥）。
我查看了其他问题并尝试将 ubuntu@ 切换到 ec2-user 和其他一些东西，但我仍然无法连接。
我也试过：trevor-larsons-macbook-pro:downloads trev$ chmod 600 trevor-learning.pem trevor-larsons-macbook-pro:downloads trev$ ssh -v -i trevor-learning ubuntu@ec2-XX-XXX-XX - XX.us-west-2.compute.amazonaws.com
这给了我：
OpenSSH_5.9p1, OpenSSL 0.9.8x 10 May 2012
Warning: Identity file trevor-learning not accessible: No such file or directory.
debug1: Reading configuration data /etc/ssh_config
debug1: /etc/ssh_config line 20: Applying options for *
debug1: Connecting to ec2-XX-XXX-XX-XX.us-west-2.compute.amazonaws.com [XX.XXX.XX.XX] port 22.
debug1: Connection established.
debug1: identity file /Users/trev/.ssh/id_rsa type -1
debug1: identity file /Users/trev/.ssh/id_rsa-cert type -1
debug1: identity file /Users/trev/.ssh/id_dsa type -1
debug1: identity file /Users/trev/.ssh/id_dsa-cert type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.9p1 Debian-5ubuntu1
debug1: match: OpenSSH_5.9p1 Debian-5ubuntu1 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 xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx
debug1: Host 'ec2-XX-XXX-XX-XX.us-west-2.compute.amazonaws.com' is known and matches the RSA host key.
debug1: Found key in /Users/trev/.ssh/known_hosts:2
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: /Users/trev/.ssh/id_rsa
debug1: Trying private key: /Users/trev/.ssh/id_dsa
debug1: No more authentication methods to try.
Permission denied (publickey).
在这里不知所措，不知道我在做什么，请帮忙！
另外，不确定这是否与它有任何关系，当我下载实例证书时（显示在 chrome 浏览器的左下方，它打开了我的钥匙串访问权限并说“发生错误。无法导入项目。内容无法检索此项目。”