Chapter 1 What’s New for FortiOS 5.2.1 : New features in FortiOS 5.2 Patch 1 : Add diagnose debug admin error-log command
  
Add diagnose debug admin error-log command
Since the last failed admin login is recorded, this new command shows details about the failed admin login attempt.
Syntax
diagnose debug admin error-log
 
Sample output
The recent admin user failed login details:
error code : -100
method : ssh
login name : test
cmdb name : null
login vdom : root
current vdom : root
override vdom : null
login profile : null
override profile: null
login time : 2014-08-29 11:01:57