开启ssh------解决远程登录失败的问题

来源：互联网发布：曼德拉效应知乎编辑：程序博客网时间：2024/05/16 08:45

有的时候别人可能登录不上你的电脑或者无法登录到服务器，最可能出现的问题就是ssh出现了问题。

[root@zong_pc zong]# /etc/init.d/sshd status      //在linux下查看ssh的状态openssh-daemon (pid  2309) 正在运行...[root@zong_pc zong]# [root@zong_pc zong]# /etc/init.d/sshd start       //若是ssh处于关闭状态，则可以手动开启服务

[root@zong_pc /]# /etc/init.d/sshd close用法： /etc/init.d/sshd {start|stop|restart|reload|force-reload|condrestart|try-restart|status}[root@zong_pc /]# /etc/init.d/sshd stop停止 sshd：                                                [确定][root@zong_pc /]# /etc/init.d/sshd statusopenssh-daemon 已停[root@zong_pc /]# /etc/init.d/sshd start正在启动 sshd：                                            [确定][root@zong_pc /]# /etc/init.d/sshd stop停止 sshd：                                                [确定][root@zong_pc /]#

可以直接按以下方法操作：

vim /etc/ssh/sshd_config        截的部分代码：  39 # Authentication: 40  41 #LoginGraceTime 2m 42 PermitRootLogin no           43 #StrictModes yes 44 #MaxAuthTries 6 45 #MaxSessions 10 46若PermitRootLogin后的参数为no，则会出现这样的提示：[root@zong_pc ssh]# ssh 192.168.40.223ssh: connect to host 192.168.40.223 port 22: No route to host具体步骤总结：：因此，只需将其后的参数改为yes就可以了。PermitRootLogin  yes修改完成后，先打开ssh：/etc/init.d/sshd start然后ssh需要重新启动 /etc/init.d/sshd restart

当然，也可能出现下面这种情况：

[root@localhost zhangna]# ssh 192.168.40.22@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!Someone could be eavesdropping on you right now (man-in-the-middle attack)!It is also possible that the RSA host key has just been changed.The fingerprint for the RSA key sent by the remote host is8b:d9:17:7d:97:d5:19:02:a1:27:9f:cc:b8:31:20:34.Please contact your system administrator.Add correct host key in /root/.ssh/known_hosts to get rid of this message.Offending key in /root/.ssh/known_hosts:1RSA host key for 192.168.40.22 has changed and you have requested strict checking.Host key verification failed.[root@localhost zhangna]# rm -rf /root/.ssh/known_hosts [root@localhost zhangna]# ssh 192.168.40.22The authenticity of host '192.168.40.22 (192.168.40.22)' can't be established.RSA key fingerprint is 8b:d9:17:7d:97:d5:19:02:a1:27:9f:cc:b8:31:20:34.Are you sure you want to continue connecting (yes/no)? yesWarning: Permanently added '192.168.40.22' (RSA) to the list of known hosts.Address 192.168.40.22 maps to localhost, but this does not map back to the address - POSSIBLE BREAK-IN ATTEMPT!root@192.168.40.22's password: Last login: Wed Jan 13 10:46:24 2016 from 192.168.40.222[root@localhost ~]#

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