Linux下ssh远程主机报错：ssh_exchange_identification: read: Connection reset by peer解决

报错信息：

 ssh_exchange_identification: read: Connection reset by peer

[root@test2 ~]# ssh [email protected]
ssh_exchange_identification: read: Connection reset by peer

报错分析：

 -v：表示查看连接的详细信息

[root@test2 ~]# ssh -v [email protected]
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 192.168.2.128 [192.168.2.128] port 22.
debug1: Connection established.
debug1: permanently_set_uid: 0/0
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：

1.在要连接的主机128上修改配置文件

[root@localhost ~]# vim /etc/hosts.allow
...
sshd:ALL       //允许其他所有ip主机连接本机

[root@localhost ~]# systemctl restart sshd

提醒：
 若是要限制只有某些IP地址可以连接该主机，则在/etc/hosts.allow文件中添加允许的主机IP（如：sshd:192.168.2.130:allow），然后再到/etc/hosts.deny文件中添加“sshd:ALL”拒绝所有（除了/etc/hosts.allow文件中允许的IP地址）就可以达到除了设置允许的IP地址可以连接，其他的IP主机都无法连接的效果。

相关博客：基于Linux下限制指定用户或IP地址通过SSH登录（访问控制）

2.重新尝试连接128主机

[root@test2 ~]# ssh [email protected]
Last login: Thu Jun 18 11:42:17 2020 from gateway

[root@localhost ~]# ifconfig ens37
ens37: flags=4163,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.2.128  netmask 255.255.255.0  broadcast 192.168.2.255
        inet6 fe80::58f3:f0e0:999e:dc3c  prefixlen 64  scopeid 0x20
        ether 00:0c:29:48:a1:65  txqueuelen 1000  (Ethernet)
        RX packets 6671316  bytes 1274253678 (1.1 GiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 7124037  bytes 3235376682 (3.0 GiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

3.查看ssh成功连接的详细信息

[root@test2 ~]# ssh -v [email protected]
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 192.168.2.128 [192.168.2.128] port 22.
debug1: Connection established.
debug1: permanently_set_uid: 0/0
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_7.4
debug1: match: OpenSSH_7.4 pat OpenSSH* compat 0x04000000
debug1: Authenticating to 192.168.2.128:22 as 'root'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: chacha20-poly1305@openssh.com MAC:  compression: none
debug1: kex: client->server cipher: chacha20-poly1305@openssh.com MAC:  compression: none
debug1: kex: curve25519-sha256 need=64 dh_need=64
debug1: kex: curve25519-sha256 need=64 dh_need=64
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ecdsa-sha2-nistp256 SHA256:NPzH2XoAuBsa8cuKFIaVQRxHPXTsq397mZklQiPanAw
debug1: Host '192.168.2.128' is known and matches the ECDSA host key.
debug1: Found key in /root/.ssh/known_hosts:9
debug1: rekey after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: rekey after 134217728 blocks
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=-sha2-256,rsa-sha2-512>
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: Offering RSA public key: /root/.ssh/id_rsa
debug1: Server accepts key: pkalg rsa-sha2-512 blen 279
debug1: Authentication succeeded (publickey).
Authenticated to 192.168.2.128 ([192.168.2.128]:22).
debug1: channel 0: new [client-session]
debug1: Requesting no-more-sessions@openssh.com
debug1: Entering interactive session.
debug1: pledge: network
debug1: client_input_global_request: rtype hostkeys-00@openssh.com want_reply 0
debug1: Sending environment.
debug1: Sending env LANG = zh_CN.UTF-8
Last login: Thu Jun 18 13:33:49 2020 from 192.168.2.129

↓↓↓↓↓↓

 最近刚申请了个微信公众号，上面也会分享一些运维知识，大家点点发财手关注一波，感谢大家。 【原创公众号】：非著名运维 【福利】：公众号回复 “资料” 送运维自学资料大礼包哦！