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What does this mean?

Event String:
The session setup from the computer 101-91664-STU failed to authenticate. The following error occurred:
  An error event occurred.  EventID: 0x000016AD
  Time Generated: 11/03/2011   09:16:43
Event String:
The session setup from the computer 107-32266-OFFIC failed to authenticate. The following error occurred:
  A warning event occurred.  EventID: 0x84350C00
  Time Generated: 11/03/2011   09:18:18
Event String: Component: Software Version Agent
  An error event occurred.  EventID: 0x0000165B
  Time Generated: 11/03/2011   09:18:47
Event String: The session setup from computer 'MAG' failed because the security database does not contain a trust account 'MAG$' referenced by the specified computer.

All these PCs were in the security database.  What mechanism could have kicked them out?

Thanks?
ASKER CERTIFIED SOLUTION
Avatar of Paul MacDonald
Paul MacDonald
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Thank you both for your comments.  The solutions provided is what we do.  I was hopeing to find out why it happens and perhaps stop it from happening.  We give laptops to kids so we have a large domain of close to 38000 PCs.  We get maybe 10 PCs a day that gets kicked off the network.  A lot of time the kids do not know to come to the office and get rejoined to the domain so homework is late and study is delayed.  Often the problem is not discovered till it is time to take an online test.  The teacher then has to stop teaching to help the one kid which is not productive and disrupts classroom flow.  If you think of something please throw me a bone.  Thanks for your time.