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Event errors 675 from unity box in domain controller event logs

Unity 3.1(5)

Anyone know if it's normal to get lots of Event 675's from the Unity server in the domain controller event logs?

See below:

Pre-authentication failed:

User Name: LEAH$

User ID: LETNET\LEAH$

Service Name: krbtgt/LETNET.NET

Pre-Authentication Type: 0x2

Failure Code: 0x18

Client Address: 10.0.2.30

I would normally not think this could be normal at all except I know 675 typically means incorrect passwords - and thought perhaps this was just lots of failed attempts by users to enter their logon credentials in the web options page or something - but hate to assume that :-(

- Ken

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