使用xshell登錄CentOS7，不能登錄，使用另外一臺Linux主機，telent 22端口是同的，ssh連接報以下錯誤：

Read from socket failed: Connection reset by peer

查看不能登錄主機的日誌

# cat /var/log/messages

Dec 15 19:38:27 localhost dbus-daemon: dbus[874]: [system] Successfully activated service ‘org.freedesktop.nm_dispatcher‘

Dec 15 19:38:27 localhost systemd: Started Network Manager Script Dispatcher Service.

Dec 15 19:38:27 localhost nm-dispatcher: Dispatching action ‘dhcp4-change‘ for eno16777736

Dec 15 19:38:33 localhost sshd[3125]: error: Could not load host key: /etc/ssh/ssh_host_rsa_key

Dec 15 19:38:33 localhost sshd[3125]: error: Could not load host key: /etc/ssh/ssh_host_ecdsa_key

Dec 15 19:38:33 localhost sshd[3125]: error: Could not load host key: /etc/ssh/ssh_host_ed25519_key

Dec 15 19:39:42 localhost sshd[3127]: error: Could not load host key: /etc/ssh/ssh_host_rsa_key

Dec 15 19:39:42 localhost sshd[3127]: error: Could not load host key: /etc/ssh/ssh_host_ecdsa_key

Dec 15 19:39:42 localhost sshd[3127]: error: Could not load host key: /etc/ssh/ssh_host_ed25519_key

Dec 15 19:44:56 localhost sshd[3136]: error: Could not load host key: /etc/ssh/ssh_host_ecdsa_key

Dec 15 19:44:56 localhost sshd[3136]: error: Could not load host key: /etc/ssh/ssh_host_ed25519_key

Dec 15 19:47:03 localhost sshd[3138]: error: Could not load host key: /etc/ssh/ssh_host_ecdsa_key

Dec 15 19:47:03 localhost sshd[3138]: error: Could not load host key: /etc/ssh/ssh_host_ed25519_key

找到問題所在，用如下命令

ssh-keygen -t dsa -P ‘‘ -f /etc/ssh/ssh_host_dsa_key

ssh-keygen -t rsa -P ‘‘ -f /etc/ssh/ssh_host_rsa_key

分別把這兩個密鑰生成就可以正常啟動和使用 ssh了 。到此問題就解決完了。

service ssh restart

重啟下服務，這個時候就可以連接了。

總結：遇到問題，不要手足無措，首先看看系統提示和日誌，好好分析以下。不行立馬百度或Google。

本文出自 “汪立明” 博客，請務必保留此出處http://afterdawn.blog.51cto.com/7503144/1922651

CentOS7使用ssh不能登錄，報錯：Read from socket failed: Connection reset by peer