为什么我不能login到这个服务器？

我正在尝试login到一个centos 6.8服务器，我有ip地址和正确的密码。 它将私钥存储在我的known_hosts文件中，但后来我忘记了。 我的同事可以从他的计算机上login，他在发送给我的id_rsa.pub文件中有私钥。 当我存储它，我仍然无法login。我自从删除该文件，但我仍然无法login，我无法理解这个错误日志下面，请帮助。

danales-MacBook-Pro:~ danale$ ssh -vvv <ip> OpenSSH_7.3p1, LibreSSL 2.4.1 debug1: Reading configuration data /Users/danale/.ssh/config debug1: Reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 20: Applying options for * debug2: resolving "<ip>" port 22 debug2: ssh_connect_direct: needpriv 0 debug1: Connecting to <ip> [<ip>] port 22. debug1: Connection established. debug1: identity file /Users/danale/.ssh/id_rsa type 1 debug1: key_load_public: No such file or directory debug1: identity file /Users/danale/.ssh/id_rsa-cert type -1 debug1: key_load_public: No such file or directory debug1: identity file /Users/danale/.ssh/id_dsa type -1 debug1: key_load_public: No such file or directory debug1: identity file /Users/danale/.ssh/id_dsa-cert type -1 debug1: key_load_public: No such file or directory debug1: identity file /Users/danale/.ssh/id_ecdsa type -1 debug1: key_load_public: No such file or directory debug1: identity file /Users/danale/.ssh/id_ecdsa-cert type -1 debug1: key_load_public: No such file or directory debug1: identity file /Users/danale/.ssh/id_ed25519 type -1 debug1: key_load_public: No such file or directory debug1: identity file /Users/danale/.ssh/id_ed25519-cert type -1 debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_7.3 debug1: Remote protocol version 2.0, remote software version OpenSSH_5.3 debug1: match: OpenSSH_5.3 pat OpenSSH_5* compat 0x0c000000 debug2: fd 3 setting O_NONBLOCK debug1: Authenticating to <ip>:22 as 'danale' debug3: hostkeys_foreach: reading file "/Users/danale/.ssh/known_hosts" debug3: record_hostkey: found key type RSA in file /Users/danale/.ssh/known_hosts:8 debug3: load_hostkeys: loaded 1 keys from 107.6.169.138 debug3: order_hostkeyalgs: prefer hostkeyalgs: [email protected],rsa-sha2-512,rsa-sha2-256,ssh-rsa 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: [email protected],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: [email protected],rsa-sha2-512,rsa-sha2-256,ssh-rsa,[email protected],[email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519 debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected],aes128-cbc,aes192-cbc,aes256-cbc,3des-cbc debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected],aes128-cbc,aes192-cbc,aes256-cbc,3des-cbc debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1 debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1 debug2: compression ctos: none,[email protected],zlib debug2: compression stoc: none,[email protected],zlib debug2: languages ctos: debug2: languages stoc: debug2: first_kex_follows 0 debug2: reserved 0 debug2: peer server KEXINIT proposal debug2: KEX algorithms: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1 debug2: host key algorithms: ssh-rsa,ssh-dss debug2: ciphers ctos: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,[email protected] debug2: ciphers stoc: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,[email protected] debug2: MACs ctos: hmac-md5,hmac-sha1,[email protected],hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96 debug2: MACs stoc: hmac-md5,hmac-sha1,[email protected],hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96 debug2: compression ctos: none,[email protected] debug2: compression stoc: none,[email protected] debug2: languages ctos: debug2: languages stoc: debug2: first_kex_follows 0 debug2: reserved 0 debug1: kex: algorithm: diffie-hellman-group-exchange-sha256 debug1: kex: host key algorithm: ssh-rsa debug1: kex: server->client cipher: aes128-ctr MAC: [email protected] compression: none debug1: kex: client->server cipher: aes128-ctr MAC: [email protected] compression: none debug3: send packet: type 34 debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(2048<3072<8192) sent debug3: receive packet: type 31 debug1: got SSH2_MSG_KEX_DH_GEX_GROUP debug2: bits set: 1507/3072 debug3: send packet: type 32 debug1: SSH2_MSG_KEX_DH_GEX_INIT sent debug3: receive packet: type 33 debug1: got SSH2_MSG_KEX_DH_GEX_REPLY debug1: Server host key: ssh-rsa SHA256:qISVJ4oOxnoEGlQp6HkKB7vNUMzTUFDc/yV4OBZjlN0 debug3: hostkeys_foreach: reading file "/Users/danale/.ssh/known_hosts" debug3: record_hostkey: found key type RSA in file /Users/danale/.ssh/known_hosts:8 debug3: load_hostkeys: loaded 1 keys from <ip> debug1: Host '<ip>' is known and matches the RSA host key. debug1: Found key in /Users/danale/.ssh/known_hosts:8 debug2: bits set: 1557/3072 debug3: send packet: type 21 debug2: set_newkeys: mode 1 debug1: rekey after 4294967296 blocks debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug3: receive packet: type 21 debug2: set_newkeys: mode 0 debug1: rekey after 4294967296 blocks debug1: SSH2_MSG_NEWKEYS received debug2: key: /Users/danale/.ssh/id_rsa (0x7ff0d0e00270) debug2: key: /Users/danale/.ssh/id_dsa (0x0) debug2: key: /Users/danale/.ssh/id_ecdsa (0x0) debug2: key: /Users/danale/.ssh/id_ed25519 (0x0) debug3: send packet: type 5 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,gssapi-keyex,gssapi-with-mic,password debug3: start over, passed a different list publickey,gssapi-keyex,gssapi-with-mic,password 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: Offering RSA public key: /Users/danale/.ssh/id_rsa debug3: send_pubkey_test 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,gssapi-keyex,gssapi-with-mic,password debug1: Trying private key: /Users/danale/.ssh/id_dsa debug3: no such identity: /Users/danale/.ssh/id_dsa: No such file or directory debug1: Trying private key: /Users/danale/.ssh/id_ecdsa debug3: no such identity: /Users/danale/.ssh/id_ecdsa: No such file or directory debug1: Trying private key: /Users/danale/.ssh/id_ed25519 debug3: no such identity: /Users/danale/.ssh/id_ed25519: No such file or directory debug2: we did not send a packet, disable method debug3: authmethod_lookup password debug3: remaining preferred: ,password debug3: authmethod_is_enabled password debug1: Next authentication method: password 

这是/ var / log / secure在我的同事terminal上所说的：

 root@server [~]# less /var/log/secure Mar 28 13:55:15 server sshd[6952]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=212.17.62.129 Mar 28 13:55:15 server sshd[6952]: pam_succeed_if(sshd:auth): error retrieving information about user dspace Mar 28 13:55:17 server sshd[6952]: Failed password for invalid user dspace from 212.17.62.129 port 53429 ssh2 Mar 28 13:55:17 server sshd[6953]: Received disconnect from 212.17.62.129: 3: com.jcraft.jsch.JSchException: Auth fail Mar 28 14:00:15 server sshd[7716]: Invalid user a from 27.41.204.187 Mar 28 14:00:15 server sshd[7732]: input_userauth_request: invalid user a Mar 28 14:00:15 server sshd[7716]: pam_unix(sshd:auth): check pass; user unknown Mar 28 14:00:15 server sshd[7716]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=27.41.204.187 Mar 28 14:00:15 server sshd[7716]: pam_succeed_if(sshd:auth): error retrieving information about user a Mar 28 14:00:17 server sshd[7716]: Failed password for invalid user a from 27.41.204.187 port 54722 ssh2 Mar 28 14:00:19 server sshd[7716]: pam_unix(sshd:auth): check pass; user unknown Mar 28 14:00:19 server sshd[7716]: pam_succeed_if(sshd:auth): error retrieving information about user a Mar 28 14:00:21 server sshd[7716]: Failed password for invalid user a from 27.41.204.187 port 54722 ssh2 Mar 28 14:00:22 server sshd[7716]: pam_unix(sshd:auth): check pass; user unknown Mar 28 14:00:22 server sshd[7716]: pam_succeed_if(sshd:auth): error retrieving information about user a Mar 28 14:00:24 server sshd[7716]: Failed password for invalid user a from 27.41.204.187 port 54722 ssh2 Mar 28 14:00:25 server sshd[7716]: pam_unix(sshd:auth): check pass; user unknown Mar 28 14:00:25 server sshd[7716]: pam_succeed_if(sshd:auth): error retrieving information about user a Mar 28 14:00:27 server sshd[7716]: Failed password for invalid user a from 27.41.204.187 port 54722 ssh2 Mar 28 14:20:19 server sshd[10806]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=123.115.51.110 user=root Mar 28 14:20:21 server sshd[10806]: Failed password for root from 123.115.51.110 port 36288 ssh2 Mar 28 14:20:23 server sshd[10806]: Failed password for root from 123.115.51.110 port 36288 ssh2 Mar 28 14:20:26 server sshd[10806]: Failed password for root from 123.115.51.110 port 36288 ssh2 Mar 28 14:20:28 server sshd[10806]: Failed password for root from 123.115.51.110 port 36288 ssh2 Mar 28 14:20:31 server sshd[10806]: Failed password for root from 123.115.51.110 port 36288 ssh2 Mar 28 14:20:33 server sshd[10806]: Failed password for root from 123.115.51.110 port 36288 ssh2 Mar 28 14:20:33 server sshd[10808]: Disconnecting: Too many authentication failures for root Mar 28 14:20:33 server sshd[10806]: PAM 5 more authentication failures; logname= uid=0 euid=0 tty=ssh ruser= rhost=123.115.51.110 user=root Mar 28 14:20:33 server sshd[10806]: PAM service(sshd) ignoring max retries; 6 > 3 Mar 28 14:22:53 server sshd[11064]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=49.65.211.86 user=root Mar 28 14:22:56 server sshd[11064]: Failed password for root from 49.65.211.86 port 38625 ssh2 Mar 28 14:22:58 server sshd[11064]: Failed password for root from 49.65.211.86 port 38625 ssh2 Mar 28 14:23:00 server sshd[11064]: Failed password for root from 49.65.211.86 port 38625 ssh2 Mar 28 14:23:02 server sshd[11064]: Failed password for root from 49.65.211.86 port 38625 ssh2 Mar 28 14:23:04 server sshd[11064]: Failed password for root from 49.65.211.86 port 38625 ssh2 Mar 28 14:26:11 server sshd[11503]: Accepted password for root from 68.46.220.105 port 53344 ssh2 Mar 28 14:26:11 server sshd[11503]: pam_unix(sshd:session): session opened for user root by (uid=0) (END) 

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