ssh_client和server功能调试

1 验证方式不支持

  如客户端登录时提示如下：

[www.linuxidc.com@CentOS-6-37 ~]$ ssh monitor@192.168.1.5

Permission denied (publickey,keyboard-interactive).

  解决方法：

    设置sshd的配置文件（sshd_config）的这条配置：PasswordAuthentication yes

    然后重启服务：service sshd restart

2 普通用户登录密码始终错误，sshd启动有报错

  sshd启动报错：

    Unsupported option GSSAPIAuthentication
    Unsupported option GSSAPICleanupCredentials

  解决方法：

    注销sshd的配置文件（sshd_config）的如下配置:

    #GSSAPIAuthentication yes
    #GSSAPICleanupCredentials yes
    #UsePAM yes

    然后重启服务：service sshd restart

3. 报错 PRNG is not seeded

root@localhost:/# /etc/init.d/ssh restart
PRNG is not seeded

After investigation we found that the /dev/urandom was not there on the VPS.

root@localhost:/dev# ls -al /dev/random
crw-r--r-- 1 root root 1, 8 Mar  2 19:28 /dev/random

root@localhost:/dev# ls -al /dev/urandom
ls: cannot access /dev/urandom: No such file or directory

By the below command, we created it and restarted SSH

root@localhost:/dev# mknod /dev/urandom c 1 9

root@localhost:/dev# /etc/init.d/ssh  restart
* Restarting OpenBSD Secure Shell server sshd
...done.

4. 报错：

PTY allocation request failed on channel 0

可以用如下方式修改

1.rm -rf /dev/ptmx
2.mknod /dev/ptmx c 5 2
3.chmod 666 /dev/ptmx
4.umount /dev/pts
5.rm -rf /dev/pts
6.mkdir /dev/pts
7.mount /dev/pts