logon failures report

logon failures report

We recently installed the products and find that all of our users that connect to us via a vpn connection flood the Logon Failures report with entries.  We've monitored the connection.  As soon as they logon to the vpn a half dozen or so logon failures appear.  They generally are remote sales people using domain computers / accounts and are accessing a server setup to share documents with them.  Any ideas why this happens?
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