Kerberos Authenication (TGT) "Event 4768" with"PID 467" and "result 0x12"

Ok so I am looking at some system logs and I have ran into multiple instances of event 4768. Like they pop up every 3-6 minutes.  All logs started on the 16th of June and are ongoing. 
I know that this particular code (4768) traces back to requesting a ticket via Kerberos Authentication (each time someone logs onto a workstation the event is logged as such). 
What I want to know is when the event 4768  is paired with "Process ID 476" and " Kerberos Result 0x12"  is this event dangerous and what can be done? 
Notes: Windows Server 2008.
Generated under "Microsoft Windows Security Auditing"
 Service ID: Null SID
I also have not seen a bunch of 4771 codes with the 0x18 error.

Hi,
Based on my research, the code 0X12 means client’s credentials have been revoked.
Would you please tell us is this error code related one specific user?
If so, please check this user account to see if it’s been locked or expired.
More information for you:
Appendix D: Kerberos and LDAP Troubleshooting Tips
http://technet.microsoft.com/en-us/library/bb463167.aspx
Best Regards,
Amy

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