本文档描述了在secureCRT连接服务器失败的情况，通过检查ssh服务状态、查看系统日志，发现ssh服务启动失败与配置文件错误有关。具体表现为ssh服务因Bad configuration option报错而终止。解决方法是进入/etc/ssh/sshd_config文件，修正AllowUsers选项的配置，将冒号改为空格。
1通过ps aux | grep ssh发现ssh服务没有启动
2尝试通过/etc/init.d/sshstart启动ssh服务不成功
3root@lee:/etc/ssh# grep ssh /var/log/syslog查看日志如下
Jun25 12:45:35 lee kernel: [ 9318.055538] init: ssh main process (4914)terminated with status 255
Jun25 12:45:35 lee kernel: [ 9318.055572] init: ssh main process ended,respawning
Jun26 09:08:22 lee kernel: [ 23.798398] init: ssh main process (1118)terminated with status 255
Jun26 09:08:22 lee kernel: [ 23.798415] init: ssh main process ended,respawning
Jun26 09:48:46 lee kernel: [ 2441.728027] init: ssh main process (4011)terminated with status 255
Jun26 09:48:46 lee kernel: [ 2441.728049] init: ssh main process ended,respawning4 4 4 root@lee:~# /usr/sbin/sshd .-Dd
/etc/ssh/sshd_config:line 15: Bad configuration option: AllowUsers:sang
/etc/ssh/sshd_config:terminating, 1 bad configuration options
5进入/etc/ssh/sshd_config文件，通过修改AllowUsers:sang中间的冒号为空格解决问题
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