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error: Could not get shadow information for NOUSER keep appearing in logs

807559Jan 20 2005 — edited Oct 31 2008
Hello all, first time post! For a few weeks now I've been getting the following errors in my logs:

error: Could not get shadow information for NOUSER

unfortunately there is no IP logged like similar posts that I've viewed through google. I've also tried to research ssh to obtain a more detailed log message but have been unsuccessful. I would like to know two things.

1. What's causing these messages? (attempted pw guessing from a machine infected with a worm or similar?)
2. What can I do to prevent whatever is causing them?

Thanks in advance!
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Locked on Nov 28 2008
Added on Jan 20 2005
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