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My Sharepoint server keeps generating a Kerberos pre-authentication failed.

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Last Modified: 2016-09-11
I am seeing from multiple servers that the administrator account is generating Kerberos pre-authentication failed.
Event id 4771
Failure Code 0x18
Service Name krbtgt/<domainname>

It does this from our SharePoint server that host the Intranet page, my Symantec End Point Server and my Citrix XenApp Server indicated in the Event Log > Security

This transaction does occasionally lock the Administrator account out.

Any ideas?
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