ACTIVE DIRECTORY

I am getting below account lock out error, what is the meaning

Log Name: Security
Source: Microsoft-Windows-Security-Auditing
Date: 12/28/2015 7:58:38 AM
Event ID: 4771
Task Category: Kerberos Authentication Service
Level: Information
Keywords: Audit Failure
User: N/A
Computer:
Description:
Kerberos pre-authentication failed.


Kerberos pre-authentication failed.

Account Information:
      Security ID:            USA\1110469
      Account Name:            1110469

Service Information:
      Service Name:            krbtgt/USA

Network Information:
      Client Address:            ::ffff:10.3.13.111
      Client Port:            59298

Additional Information:
      Ticket Options:            0x40810010
      Failure Code:            0x18
      Pre-Authentication Type:      2

Certificate Information:
      Certificate Issuer Name:            
      Certificate Serial Number:       
      Certificate Thumbprint:            

Certificate information is only provided if a certificate was used for pre-authentication.

Pre-authentication types, ticket options and failure codes are defined in RFC 4120.