我是使用EC2的新手，遇到一个无法解决的问题。我遵循指南来设置EC2实例，并使用ssh进行连接。
ssh -v -i ~/.ssh/EC2MyKeyPair.pem ec2-user@ec2-xx-xxx-xxx-xx.us-east-2.compute.amazonaws.com
我已将pem文件的权限更改为400
chmod 400 ~/.ssh/EC2MyKeyPair.pem
此外，我试图将用户名更改为admin，ubuntu...。但是指南中列出的所有用户名均失败。
我试图读取调试日志，但是找不到问题。似乎用户名“ ec2-user”是正确的，可以找到“ key_load_public”吗？什么原因导致连接失败？
谢谢！
OpenSSH_7.6p1, LibreSSL 2.6.2
debug1: Reading configuration data /Users/xxx/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 48: Applying options for *
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to ec2-xx-xxx-xx-xxx.us-east-2.compute.amazonaws.com port 22.
debug1: Connection established.
debug1: key_load_public: No such file or directory
debug1: identity file /Users/xxx/.ssh/EC2MyKeyPair.pem type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/xxx/.ssh/EC2MyKeyPair.pem-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_7.6
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.4
debug1: match: OpenSSH_7.4 pat OpenSSH* compat 0x04000000
debug3: fd 5 is O_NONBLOCK
debug1: Authenticating to ec2-xx-xxx-xx-xxx.us-east-2.compute.amazonaws.com:22 as 'ec2-user'
debug3: hostkeys_foreach: reading file "/Users/xxx/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /Users/xxx/.ssh/known_hosts:13
debug3: load_hostkeys: loaded 1 keys from ec2-xx-xxx-xx-xxx.us-east-2.compute.amazonaws.com
debug3: order_hostkeyalgs: prefer hostkeyalgs: ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521
debug3: send packet: type 20
debug1: SSH2_MSG_KEXINIT sent
debug3: receive packet: type 20
debug1: SSH2_MSG_KEXINIT received
debug2: local client KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,ext-info-c
debug2: host key algorithms: ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa
debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
debug2: MACs ctos: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,zlib@openssh.com,zlib
debug2: compression stoc: none,zlib@openssh.com,zlib
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug2: peer server KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
debug2: host key algorithms: ssh-rsa,rsa-sha2-512,rsa-sha2-256,ecdsa-sha2-nistp256,ssh-ed25519
debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,aes128-cbc,aes192-cbc,aes256-cbc,blowfish-cbc,cast128-cbc,3des-cbc
debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com,aes128-cbc,aes192-cbc,aes256-cbc,blowfish-cbc,cast128-cbc,3des-cbc
debug2: MACs ctos: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,zlib@openssh.com
debug2: compression stoc: none,zlib@openssh.com
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
debug1: kex: client->server cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
debug3: send packet: type 30
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug3: receive packet: type 31
debug1: Server host key: ecdsa-sha2-nistp256 SHA256:xxxxxxxx/xxxx/xxxxxxxxxxxx+xxxxxxxxxxxxxxxx
debug3: hostkeys_foreach: reading file "/Users/xxx/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /Users/xxx/.ssh/known_hosts:13
debug3: load_hostkeys: loaded 1 keys from ec2-xx-xxx-xx-xxx.us-east-2.compute.amazonaws.com
debug3: hostkeys_foreach: reading file "/Users/xxx/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /Users/xxx/.ssh/known_hosts:13
debug3: load_hostkeys: loaded 1 keys from 18.223.29.186
debug1: Host 'ec2-xx-xxx-xx-xxx.us-east-2.compute.amazonaws.com' is known and matches the ECDSA host key.
debug1: Found key in /Users/xxx/.ssh/known_hosts:13
debug3: send packet: type 21
debug2: set_newkeys: mode 1
debug1: rekey after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug3: receive packet: type 21
debug1: SSH2_MSG_NEWKEYS received
debug2: set_newkeys: mode 0
debug1: rekey after 134217728 blocks
debug2: key: /Users/xxx/.ssh/EC2MyKeyPair.pem (0x0), explicit
debug3: send packet: type 5
debug3: receive packet: type 7
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<rsa-sha2-256,rsa-sha2-512>
debug3: receive packet: type 6
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug3: send packet: type 50
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey
debug3: start over, passed a different list publickey
debug3: preferred publickey,keyboard-interactive,password
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Trying private key: /Users/xxx/.ssh/EC2MyKeyPair.pem
debug3: sign_and_send_pubkey: RSA SHA256:XR1+xxxxxxxx+xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
debug3: send packet: type 50
debug2: we sent a publickey packet, wait for reply
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey
debug2: we did not send a packet, disable method
debug1: No more authentication methods to try.
ec2-user@ec2-xx-xxx-xx-xxx.us-east-2.compute.amazonaws.com: Permission denied (publickey).
已更新： 有关更多信息，请在〜/ .ssh
下的文件drwx------ 7 xxx staff 224 Oct 28 16:15 .
drwxr-xr-x+ 100 xxx staff 3200 Oct 28 16:50 ..
-r--------@ 1 xxx staff 1696 Oct 28 16:14 EC2MyKeyPair.pem
-rw-r--r-- 1 xxx staff 451 Dec 19 2016 config
-r-------- 1 xxx staff 1675 Apr 28 2015 id_rsa
-r-------- 1 xxx staff 405 Apr 28 2015 id_rsa.pub
-rw-r--r-- 1 xxx staff 4496 Oct 28 16:20 known_hosts
我阅读了一些参考资料，他们的日志包含访问id_rsa的信息，但我不知道为什么我的日志没有访问...。