EC2 インスタンスを作成し、適切に ssh できました。
次に、インスタンスを停止しました
再起動すると、次のエラーが発生しました
Aloks-MacBook-Pro:AWS alokmandloi$ ssh -i working_key.pem ubuntu@ec2-184-73-22-113.compute-1.amazonaws.com
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that a host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
3d:f2:79:cc:38:66:83:71:1b:86:6c:7e:36:ad:27:bc.
Please contact your system administrator.
Add correct host key in /Users/alokmandloi/.ssh/known_hosts to get rid of this message.
Offending RSA key in /Users/alokmandloi/.ssh/known_hosts:11
RSA host key for ec2-184-73-22-113.compute-1.amazonaws.com has changed and you have requested strict checking.
Host key verification failed.
解決策を調べたところ、http://www.thegeekstuff.com/2010/04/how-to-fix-offending-key-in-sshknown_hosts-file/が見つかりました
これは、known_hosts の 11 番目のエントリを削除することを提案しました。それをした後、次のエラーが表示されます
Aloks-MacBook-Pro:AWS alokmandloi$ ssh -v -i working_key.pem ubuntu@ec2-184-73-22-113.compute-1.amazonaws.com
OpenSSH_5.9p1, OpenSSL 0.9.8r 8 Feb 2011
debug1: Reading configuration data /etc/ssh_config
debug1: /etc/ssh_config line 20: Applying options for *
debug1: Connecting to ec2-184-73-22-113.compute-1.amazonaws.com [184.73.22.113] port 22.
debug1: Connection established.
debug1: identity file working_key.pem type -1
debug1: identity file working_key.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 3d:f2:79:cc:38:66:83:71:1b:86:6c:7e:36:ad:27:bc
debug1: Host 'ec2-184-73-22-113.compute-1.amazonaws.com' is known and matches the RSA host key.
debug1: Found key in /Users/alokmandloi/.ssh/known_hosts:10
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: working_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).