ssh -vi sec.ppk ubuntu@ec2-xx.compute-1.amazonaws.com

但连接失败

这是上述命令生成的调试输出

OpenSSH_5.3p1 Debian-3ubuntu7,OpenSSL 0.9.8k 25 Mar 2009
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug1: Connecting to ec2-xx.compute-1.amazonaws.com port 22.
debug1: Connection established.
debug1: identity file security1.ppk type -1
debug1: Remote protocol version 2.0,remote software version OpenSSH_5.5p1 Debian-4ubuntu5
debug1: match: OpenSSH_5.5p1 Debian-4ubuntu5 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.3p1 Debian-3ubuntu7
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 'ec2-xx.compute-1.amazonaws.com' is known and matches the RSA host key.
debug1: Found key in /home/ma/.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: 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: sec.ppk
debug1: PEM_read_PrivateKey Failed
debug1: read PEM private key done: type <unknown>
Enter passphrase for key 'sec.ppk':

为什么要求密码为sec.ppk

有什么问题？谁能帮忙？

忘了提到，我使用FileZilla成功地建立了与上述凭据相同的连接