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tiras gansFlag for United States of America

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User getting locked out

I got a user whos account getting locked out several times a day.   He saying happens when he trying to put his password into iphone and ipad.  He swears he puts a correct password.

In the event log I see event 675
Pre-authentication failed:
       User Name:      username
       User ID:            domain\rwyman
       Service Name:      krbtgt/domain
       Pre-Authentication Type:      0x2
       Failure Code:      0x12
       Client Address:      10.1.10.10
and the next event 680:
Logon attempt by:      MICROSOFT_AUTHENTICATION_PACKAGE_V1_0
 Logon account:      username
 Source Workstation:      hislaptop
 Error Code:      0xC0000234

I'm confused why itis coming from his laptop as a source if he is trying from iphone/ipad. Also I see other users have the same events but this one only getting locked out...

Please advice.
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Randy Downs
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ASKER

Do I install it on the Domain Controller or the user's workstation?
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Thanks.