度娘没找到解决办法,上bing国际版,直接跳到Juniper英文页面,还好有救
Cause:
Permission is missing in the authentication file.
File corruption with pam.conf or pam.conf+ file.
原因:
身份验证文件中缺少权限。
pam.conf或pam.conf+文件损坏。 
解决办法:
root#exit
root>start shell    #启动shell
root:RE:0%
root:RE:0%  ls -lo  /var/etc/pam    #检查pam开头的文件权限
ls: /var/etc/pam: No such file or directory    #!竟然没有这个文件!囧
root:RE:0%  ls -lo  /var/etc/  #换个方法,查上层路径
total 324
...
-rw-r-----  1 root  wheel  -   203 Mar  6 09:16 pam.conf
-rw-r-----  1 root  wheel  -   203 Mar  6 09:08 pam.conf-
...
还好有找到
root:RE:0% chflags 0 /var/etc/pam.conf+
root:RE:0% chmod 777 /var/etc/pam.conf
重新设置权限
root:RE:0% cli
{master:0}
root>edit
Entering configuration mode
{master:0}[edit]
root# commit full
configuration check succeeds
commit complete
解决问题
原文:https://blog.51cto.com/lisiyun/2358799