加载中…SSH远程连接提示ssh_exchange_identification:readconnectionresetbypeer处理
(2018-12-13 15:48:52)| 分类： 实用技巧 |
在我们远程连接之前，可以在本低ssh上输入命令判断当前是否能够建立连接：
ssh -v 要连接的IP地址
如果提示下面信息说明连接是拒绝的：
OpenSSH_7.4p1, OpenSSL 1.0.2k-fips 26 Jan
2017
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 58: Applying options for
*
debug1: Connecting to IP [IP] port 22.
debug1: Connection established.
debug1: permanently_set_uid: 0/0
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_rsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.4
ssh_exchange_identification: read: Connection reset by
peer
解决方法：需要在远程服务器防火墙或者/etc/hosts.allow文件中设置允许该IP的sshd连接。
再次尝试连接如果提示输入密码则连接是允许的：
[root@116-206-107-59 ~]# ssh -v IP
OpenSSH_7.4p1, OpenSSL 1.0.2k-fips 26 Jan
2017
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 58: Applying options for
*
debug1: Connecting to IP [IP] port 22.
debug1: Connection established.
debug1: permanently_set_uid: 0/0
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_rsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.4
debug1: Remote protocol version 2.0, remote software version
OpenSSH_5.3
debug1: match: OpenSSH_5.3 pat OpenSSH_5* compat
0x0c000000
debug1: Authenticating to IP:22 as 'root'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: algorithm:
diffie-hellman-group-exchange-sha256
debug1: kex: host key algorithm: ssh-rsa
debug1: kex: server->client cipher: aes128-ctr MAC:
umac-64@openssh.com compression: none
debug1: kex: client->server cipher: aes128-ctr MAC:
umac-64@openssh.com compression: none
debug1: kex: diffie-hellman-group-exchange-sha256 need=16
dh_need=16
debug1: kex: diffie-hellman-group-exchange-sha256 need=16
dh_need=16
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<3072<8192)
sent
debug1: got SSH2_MSG_KEX_DH_GEX_GROUP
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: got SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Server host key: ssh-rsa
SHA256:SFO0+4SERR1IY8dkQXPBCD3iQ8PXqhHnQszPdRXYNDU
debug1: Host 'IP' is known and matches the RSA host key.
debug1: Found key in /root/.ssh/known_hosts:3
debug1: rekey after 4294967296 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: rekey after 4294967296 blocks
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue:
publickey,gssapi-keyex,gssapi-with-mic,password
debug1: Next authentication method: gssapi-keyex
debug1: No valid Key exchange context
debug1: Next authentication method: gssapi-with-mic
debug1: Unspecified GSS failure. Minor code
may provide more information
No Kerberos credentials available (default cache:
KEYRING:persistent:0)
debug1: Unspecified GSS failure. Minor code
may provide more information
No Kerberos credentials available (default cache:
KEYRING:persistent:0)
debug1: Next authentication method: publickey
debug1: Trying private key: /root/.ssh/id_rsa
debug1: Trying private key: /root/.ssh/id_dsa
debug1: Trying private key: /root/.ssh/id_ecdsa
debug1: Trying private key: /root/.ssh/id_ed25519
debug1: Next authentication method: password
root@IP's password:
所以在服务器设置允许指定IP才能sshd登陆是很重要的，即便黑客破解了密码，也是无法登陆的，设置添加白名单方法如下：
编辑/etc/hosts.allow
sshd : IP1 : allow
sshd : IP2 : allow
sshd : IP3 : allow
sshd : IP4 : allow
sshd : IP5 : allow
sshd : IP6: allow
sshd : IP7 : allow
sshd : ALL : deny
WHM/cPanel设置如下：
whostmgrd : IP1 : allow
whostmgrd : IP2 : allow
whostmgrd : IP3 : allow
whostmgrd : IP4 : allow
whostmgrd : ALL : deny
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